My Inquiry
My Account
NXP Semiconductors MC9RS08KA1CSC
- Part No.:
- MC9RS08KA1CSC
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC9RS08KA1CSC.pdf
- Description:
- IC MCU 8BIT 1KB FLASH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC9RS08KA1CSC from Freescale Semiconductor is an 8-bit RS08 microcontroller featuring a trimmable 20-MHz internal clock source, 1024 bytes of on-chip Flash EEPROM, 63 bytes of RAM, and integrated peripherals including an analog comparator (ACMP), modulo timer (MTIM), and keyboard interrupt (KBI) module. It operates at up to 10 MHz bus frequency and supports Wait/Stop low-power modes with wake-up via RTI, KBI, or ACMP - ideal for ultra-low-cost sensor interface and simple control applications in space-constrained designs.
For engineers reviewing the MC9RS08KA1CSC datasheet, MC9RS08KA1CSC pinout, MC9RS08KA1CSC application, or MC9RS08KA1CSC equivalent, this device requires attention to its 6-pin DFN package constraints, fixed internal bandgap reference for ACMP, single-breakpoint background debug capability, and absence of UART/SPI/I²C interfaces - making it suitable for minimal-footprint, battery-operated embedded functions where code size and power efficiency are prioritized over communication flexibility.
Technical Context
The MC9RS08KA1CSC implements the RS08 CPU core with simplified S08 instruction set extensions, including tiny addressing mode (0–15) and short addressing mode (0–31), enabling single-byte instructions for fastest access to critical registers and I/O. Its Internal Clock Source (ICS) provides factory-trimmed 20-MHz operation with ±0.2% trim resolution and ±2% deviation across voltage and temperature.
Peripherals are tightly coupled to low-pin-count operation: the analog comparator supports rail-to-rail input and internal bandgap reference, operates in Stop mode, and shares pins with BKGD and reset; the 8-bit modulo timer offers basic timing and PWM generation; and the KBI supports edge-triggered interrupts on up to three inputs - all mapped within the 6-pin DFN footprint with two GPIOs, one dedicated input, and one dedicated output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RS08 8-bit CPU with tiny/short addressing modes - enables compact code and fast register access in memory-constrained 1KB Flash. |
| Flash Memory | 1024 bytes - sufficient for firmware with basic sensor polling, logic control, and minimal state management. |
| RAM | 63 bytes - supports stack, global variables, and small buffers without external memory. |
| Max Bus Frequency | 10 MHz - defines real-time response limit for I/O handling and timer resolution. |
| Internal Clock | Trimmable 20-MHz ICS with ±2% accuracy over temp/voltage - eliminates need for external crystal in cost-sensitive designs. |
| Power Modes | Wait and Stop modes with RTI/KBI/ACMP wake-up - achieves sub-µA stop current for battery life extension. |
| Comparator | ACMP with internal bandgap reference and rail-to-rail input - enables threshold detection without external reference components. |
Pinout & Package
MC9RS08KA1CSC is housed in a 6-pin dual flat no-lead (DFN) package (case outline 98ASA00735D), measuring 2.0 × 2.0 × 0.55 mm, with exposed thermal pad. Pin assignment is validated per Freescale's MC9RS08KA2 Series Data Sheet Rev. 4 (covers MC9RS08KA1) and Appendix B mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 1.8–3.6 V supply rail; must be decoupled locally for stable ICS and ACMP operation. |
| VSS | GND | Digital ground reference; tied to exposed pad for thermal and noise performance. |
| PTA2/KBIP2/TCLK/RESET/VPP | Multi-function pin | Configurable as KBI input, timer clock source, active-low reset, or programming voltage - default reset function dominates at power-up. |
| PTA3/ACMPO/BKGD/MS | Multi-function pin | Serves as ACMP output, background debug interface (BKGD), or master select; shared use requires careful mode sequencing during debug or runtime. |
| PTA0 | GPIO / KBI input | General-purpose input/output with keyboard interrupt capability - usable as digital input with pullup/pulldown control. |
| PTA1 | GPIO / KBI input | Second GPIO with KBI support; both PTA0 and PTA1 enable two-key wake-up from Stop mode. |
Key Features
| Feature | Design Value |
|---|---|
| Trimmable internal oscillator | 20-MHz ICS with 0.2% trim resolution enables accurate timing without external crystal - reduces BOM count and PCB area. |
| Rail-to-rail analog comparator | ACMP accepts inputs from VSS to VDD and compares against internal 1.22 V bandgap - supports direct battery monitoring or sensor thresholding. |
| Single-breakpoint background debug | BKGD pin enables in-circuit debugging with one hardware breakpoint - simplifies firmware validation without JTAG overhead. |
| Low-pin-count peripheral integration | All core functions (timer, comparator, KBI, COP watchdog) fit within 6-pin DFN - targets designs where every mm² and pin matters. |
| Stop-mode wake-up sources | RTI, KBI, and ACMP retain functionality in Stop mode - allows µA-level sleep current while maintaining responsiveness to events. |
Applications
| Smart Sensor Node | Portable Medical Indicator |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor with LED alert on threshold breach. IC Role / Device Role / Timing Role: MCU executes periodic ADC sampling (via external ADC), processes data, drives LED via GPIO, and wakes from Stop mode on ACMP-detected threshold. Use Value: 1024-byte Flash holds calibrated lookup tables and state machine; 63-byte RAM stores last reading and flags; ACMP with internal reference avoids external voltage divider. |
Use Scenario: Disposable pulse oximeter indicator with visual feedback for saturation level. IC Role / Device Role / Timing Role: Controls LED blink pattern based on analog input from photodiode amplifier; uses MTIM for precise blink timing and KBI for user button press. Use Value: 6-pin DFN fits inside pen-sized housing; Stop-mode wake-up on button press extends coin-cell life beyond 12 months; no UART needed for basic indicator function. |
| Industrial Status Monitor | Appliance Safety Interlock |
Use Scenario: Panel-mounted status light for HVAC airflow verification using differential pressure switch. IC Role / Device Role / Timing Role: Reads mechanical switch closure via PTA0/PTA1 KBI pins; debounces in firmware; toggles output LED; logs fault count in Flash. Use Value: COP watchdog ensures reliable recovery from transient faults; low-voltage detect prevents erratic behavior during brownout; 1KB Flash retains error counters across power cycles. |
Use Scenario: Door interlock in microwave oven that disables magnetron if latch opens during operation. IC Role / Device Role / Timing Role: Monitors reed switch input via KBI; asserts shutdown signal within <100 µs of interruption; uses ACMP to verify supply stability before enabling output. Use Value: ACMP rail-to-rail operation confirms VDD ≥ 2.0 V before safety action; Stop-mode wake-up not required - Run mode suffices for deterministic response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CSC | 2048-byte Flash, same 6-pin DFN package and peripheral set - double program storage with identical pinout and debug interface. | Required when firmware exceeds 1KB or needs future expansion headroom without layout change. | Select MC9RS08KA2CSC if code size growth is anticipated; otherwise MC9RS08KA1CSC minimizes cost and flash wear in static firmware deployments. |
| STM8S003F3P6 | 32-pin LQFP, 8 KB Flash, 1 KB RAM, 10-bit ADC, UART, SPI - significantly more resources and interfaces but larger footprint and higher BOM cost. | Suitable when analog sensing, serial telemetry, or multi-sensor fusion is needed - not drop-in replaceable due to pin count and feature mismatch. | Choose STM8S003F3P6 only when MC9RS08KA1CSC lacks required peripherals; avoid for pure GPIO/timer/comparator use cases due to over-specification. |
Compared with MC9RS08KA2CSC, the MC9RS08KA1CSC trades half the Flash capacity for lower unit cost and reduced die size - optimal for immutable, field-proven firmware. Against STM8S003F3P6, it offers superior cost and footprint efficiency for minimal-control roles, though forfeits ADC and communication interfaces essential for data-rich systems.
Availability
MC9RS08KA1CSC is available at Aetrix Electronics and suitable for smart sensor nodes, portable medical indicators, industrial status monitors, and appliance safety interlocks requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MC9RS08KA1CSC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.
The MC9RS08KA1CSC belongs to the RS08 microcontroller family, designed specifically for ultra-low-cost, ultra-small-footprint embedded control applications where minimal pin count, integrated analog functions, and robust debug capability outweigh the need for communication interfaces or large memory.
FAQ
What is the maximum operating frequency of the MC9RS08KA1CSC internal bus?
The MC9RS08KA1CSC supports a maximum bus frequency of 10 MHz, derived from its internal 20-MHz clock source via a divide-by-2 configuration. This frequency defines the upper limit for instruction execution speed, timer resolution, and I/O toggle rate. Operating above 10 MHz violates electrical specifications and may cause unpredictable behavior or failure to meet timing margins in peripherals like ACMP or KBI.
Does the MC9RS08KA1CSC include a hardware UART or SPI interface?
No, the MC9RS08KA1CSC does not include a hardware UART, SPI, or I²C interface. Its peripheral set is limited to an 8-bit modulo timer (MTIM), analog comparator (ACMP), keyboard interrupt (KBI), and background debug (BKGD) pin. Communication must be implemented in firmware using bit-banged GPIO if required - but the device is intended for applications where such interfaces are unnecessary due to local control or minimal data exchange.
How much Flash memory does the MC9RS08KA1CSC have, and is it reprogrammable in-circuit?
The MC9RS08KA1CSC contains 1024 bytes of on-chip Flash EEPROM, which is fully reprogrammable in-circuit via the BKGD pin using Freescale's background debug protocol. Flash supports erase/write cycles typical of SuperFlash® technology (≥10k cycles), and security features allow mass erase protection. No external programmer is needed - standard BDM tools like the DEMO9RS08KA2 development board support full firmware update and debugging.
Can the MC9RS08KA1CSC operate from a 1.8 V supply, and what is its minimum operating voltage?
Yes, the MC9RS08KA1CSC operates across a supply range of 1.8 V to 3.6 V. Its minimum specified operating voltage is 1.8 V, below which the internal clock source and peripherals (including ACMP and KBI) may fail to meet timing or functional specifications. Low-voltage detection (LVD) can be enabled to generate reset or interrupt at programmable thresholds (e.g., 1.72 V), ensuring safe shutdown before functional collapse.
What debug capabilities does the MC9RS08KA1CSC provide, and is JTAG supported?
The MC9RS08KA1CSC provides a single-wire background debug (BKGD) interface via the PTA3 pin, supporting in-circuit programming, single-step execution, and one hardware breakpoint. JTAG is not supported - the BKGD interface is simpler, lower-pin-count, and sufficient for basic firmware validation. Debug tools such as the OSBDM or Cyclone MAX are compatible, and no additional pins or connectors are required beyond the 6-pin DFN footprint.
MC9RS08KA1CSC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- RS08
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Core Processor:
- RS08
- Core Size:
- 8-Bit
- Speed:
- 10MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, WDT
- Number of I/O:
- 4
- Program Memory Size:
- 1KB (1K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 63 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9RS08KA1CSC FAQ
1.How can I place an order for MC9RS08KA1CSC through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9RS08KA1CSC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC9RS08KA1CSC reliable?
The price and inventory of MC9RS08KA1CSC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9RS08KA1CSC is usually 5 days.
3.What payment methods are accepted for MC9RS08KA1CSC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9RS08KA1CSC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9RS08KA1CSC?
MC9RS08KA1CSC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9RS08KA1CSC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC9RS08KA1CSC?
For technical support, including MC9RS08KA1CSC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9RS08KA1CSC requirements.
6.How does Aetrix verify that MC9RS08KA1CSC is sourced from the original manufacturer or authorized distributors?
All MC9RS08KA1CSC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC9RS08KA1CSC meets industry standards.
7.What is the process for return or replacement of MC9RS08KA1CSC?
All MC9RS08KA1CSC units undergo pre-shipment inspection (PSI). If there is an issue with MC9RS08KA1CSC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC9RS08KA1CSC part is unused and in its original packaging.
Return procedure for MC9RS08KA1CSC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC9RS08KA1CSC Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
