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NXP Semiconductors MCR908JK3EMDWE
- Part No.:
- MCR908JK3EMDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MCR908JK3EMDWE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
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Product details
Overview
MCR908JK3EMDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It features a 20-pin SOIC package, internal RC oscillator (4 MHz nominal), and supports keyboard interrupt, timer interface, and COP watchdog - used in cost-sensitive industrial control panels and appliance user-interface modules.
For engineers reviewing the MCR908JK3EMDWE datasheet, MCR908JK3EMDWE pinout, MCR908JK3EMDWE application, or MCR908JK3EMDWE equivalent, key selection criteria include its 4 KB FLASH endurance (10K erase/write cycles), 8-bit ADC resolution with 8 input channels, 20-pin SOIC thermal profile (θJA = 120°C/W), and native support for monitor ROM-based in-system programming via SCI.
Technical Context
The MCR908JK3EMDWE implements the HCS08 CPU core with 16-bit address bus, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) provides clock generation from internal RC oscillator or external crystal, configurable reset sources (POR, LVI, COP), and low-power Wait/Stop modes with wake-up via IRQ or KBI.
It integrates a Timer Interface Module (TIM) with two 16-bit channels supporting input capture, output compare, and PWM generation, plus a Keyboard Interrupt Module (KBI) with debounced scan capability across up to 8 pins - enabling direct matrix keypad interfacing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 16-bit addressing; executes instructions at up to 8 MHz bus speed. |
| FLASH Memory | 4 KB on-chip FLASH with 10,000 erase/write cycles; supports in-application programming via monitor ROM. |
| RAM | 192 bytes of on-chip RAM; retains data during Wait mode, lost in Stop mode unless VDD ≥ 2.7 V. |
| ADC | 8-channel 8-bit successive-approximation ADC; conversion time ≤ 25 μs per sample at 4 MHz bus clock. |
| Oscillator | Internal RC oscillator (4 MHz ±2% over temperature); supports external crystal (1–8 MHz) or ceramic resonator. |
| I/O Pins | 16 general-purpose I/O pins across Ports A, B, and D; includes pull-up enable, interrupt-capable KBI inputs. |
| Package | 20-pin SOIC (7.5 mm × 12.8 mm); RoHS-compliant, JEDEC MS-013AC, θJA = 120°C/W. |
Pinout & Package
20-pin Small Outline Integrated Circuit (SOIC) package with standard JEDEC MS-013AC footprint and 1.27 mm pitch. Thermal resistance θJA = 120°C/W enables operation up to +85°C ambient in typical PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 3.3–5.5 V supply; powers core, FLASH, RAM, and I/O buffers. |
| VSS | Ground reference | Digital ground return path; must be low-impedance connection to minimize noise coupling. |
| OSC1 / XTAL1 | Clock input | Crystal/resonator input terminal for external oscillator configuration (not used with internal RC). |
| OSC2 / PTA6 / RCCLK | Clock output / I/O / RC clock | Crystal amplifier output; also functions as Port A bit 6 or internal RC oscillator clock source. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit port with individual direction control (DDRA), pull-up enable (PTAPUE), and KBI capability on PTA0–PTA3. |
| PTB0–PTB3 | Port B bidirectional I/O | 4-bit port with direction control (DDRB); PTB0 serves as IRQ1 external interrupt input. |
| PTD0–PTD3 | Port D bidirectional I/O | 4-bit port with direction control (DDRD); PTD0–PTD3 support analog input for ADC channel selection. |
| RESET | Active-low reset input | Asynchronous reset pin; triggers hardware reset when pulled low for ≥ 2 µs; internal pull-up enabled. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM bootloader | 256-byte embedded ROM enabling UART-based FLASH programming without external programmer. |
| Keyboard Interrupt Module (KBI) | Hardware-accelerated scan of up to 8 keys with automatic debounce and interrupt-on-change detection. |
| Timer Interface Module (TIM) | Dual 16-bit counter/timer with input capture, buffered/unbuffered output compare, and PWM generation. |
| Low-voltage inhibit (LVI) | Configurable brown-out detection (2.5 V or 3.0 V threshold) with reset or interrupt assertion. |
| COP watchdog timer | Configurable timeout (0.5 ms to 1.0 s) with software-serviced window; prevents runaway code execution. |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
|
Use Scenario: Embedded UI for microwave oven with LED display, membrane keypad, and relay drivers. IC Role / Device Role / Timing Role: Main controller executing state machine, scanning 4×4 keypad via KBI, driving 7-segment display via GPIO, and managing cooking timers via TIM. Use Value: Eliminates need for external keypad scanner IC and discrete timer circuits; reduces BOM count by 3–4 components. |
Use Scenario: Battery-powered temperature/humidity sensor node transmitting data via RS-485 to PLC. IC Role / Device Role / Timing Role: Data acquisition controller reading analog sensors via ADC, formatting packets, and managing UART communication timing. Use Value: Internal RC oscillator eliminates crystal cost and layout area; Stop mode draws <1 µA, extending battery life to >2 years. |
| Point-of-Sale Terminal Keypad | Motorized Valve Actuator |
|
Use Scenario: Secure PIN entry pad with tamper-detection switches and encrypted serial interface. IC Role / Device Role / Timing Role: Security-critical input processor validating keypress sequence, detecting short/open switch faults, and triggering secure erase on tamper event. Use Value: KBI hardware scan prevents software timing attacks; COP watchdog ensures firmware integrity during cryptographic operations. |
Use Scenario: HVAC zone valve actuator with position feedback, limit switch monitoring, and PWM-controlled DC motor drive. IC Role / Device Role / Timing Role: Motion controller generating variable-duty-cycle PWM for motor speed regulation and reading potentiometer feedback via ADC channel 0. Use Value: TIM's buffered PWM prevents output glitches during firmware updates; ADC sampling synchronized to PWM period minimizes EMI-induced noise. |
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 | RS08 core, 2 KB FLASH, 128 B RAM, no KBI; uses internal 1–20 MHz oscillator with tighter tolerance (±1%). | Lacks hardware keyboard scan; requires software polling or external logic for keypad interfaces. | Select when lower cost and higher oscillator accuracy outweigh KBI requirement. |
| MC9S08QG4CDTE | HCS08 core, 4 KB FLASH, 256 B RAM, 16-pin TSSOP; includes SPI/I²C but no KBI module. | Smaller footprint and added serial interfaces, but missing dedicated KBI hardware for matrix keypads. | Choose for space-constrained designs needing serial comms and where keypad is handled externally. |
Compared with MC9RS08KA2CSC and MC9S08QG4CDTE, the MCR908JK3EMDWE uniquely delivers integrated keyboard interrupt scanning and 20-pin SOIC mechanical compatibility - making it optimal for legacy-replacement or cost-driven UI control applications requiring minimal external components.
Availability
MCR908JK3EMDWE is available at Aetrix Electronics and suitable for industrial control panels, appliance user interfaces, and sensor nodes requiring stable component supply, long-term lifecycle support, and drop-in replacement capability for existing HCS08-based designs.
Supply support for MCR908JK3EMDWE 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
NXP Semiconductors acquired Freescale in 2015 and maintains full technical and supply-chain support for the HCS08 MCU family, including legacy documentation, toolchain compatibility, and long-term product availability commitments.
The MCR908JK3EMDWE belongs to the HCS08 family designed specifically for cost-sensitive, low-power embedded control applications - emphasizing integration of human-interface peripherals (KBI, ADC, TIM) with robust flash memory and debug-friendly monitor ROM.
FAQ
What is the maximum operating frequency of the MCR908JK3EMDWE?
The MCR908JK3EMDWE supports a maximum bus clock frequency of 8 MHz, derived from its internal 4 MHz RC oscillator (doubled via PLL) or external crystal up to 8 MHz. The HCS08 core executes most instructions in 1–3 bus cycles, enabling deterministic real-time response in control loops and interrupt service routines. This timing is fully specified in Section 18.7 (5V Control Timing) of the MC68H(R)C908JL3 Technical Data document.
Does the MCR908JK3EMDWE support in-system programming (ISP)?
Yes, the MCR908JK3EMDWE supports ISP via its 256-byte Monitor ROM, accessible through the SCI interface using standard UART commands. This allows field firmware updates without removing the device from the PCB. The process requires only VDD, GND, TXD, and RXD connections - no external programmer or high-voltage signals. Full command syntax and baud rate setup are documented in Section 9 of the MC68H(R)C908JL3 Technical Data.
How many ADC channels does the MCR908JK3EMDWE have, and what is their resolution?
The MCR908JK3EMDWE integrates an 8-bit successive-approximation ADC with 8 selectable input channels (AD0–AD7), mapped to PTD0–PTD3 and PTA0–PTA3. Each conversion completes in ≤25 μs at 4 MHz bus clock, with ±1 LSB integral nonlinearity and monotonic transfer function across the full 0–VDD range. These specifications are confirmed in Sections 11.3–11.5 and Table 18-13 of the MC68H(R)C908JL3 Technical Data.
Can the MCR908JK3EMDWE operate from a 3.3 V supply?
Yes, the MCR908JK3EMDWE operates across a 3.3–5.5 V supply range, with full functionality guaranteed down to 3.3 V at temperatures up to +85°C. At 3.3 V, the internal RC oscillator remains stable (±2% tolerance), and all I/O pins maintain TTL-compatible thresholds. Electrical characteristics for 3.3 V operation - including current consumption, timing, and ADC performance - are detailed in Sections 18.9–18.11 of the MC68H(R)C908JL3 Technical Data.
What debug and development tools are compatible with the MCR908JK3EMDWE?
The MCR908JK3EMDWE is supported by the CodeWarrior Development Studio for HCS08 (v5.1+), including full JTAG debugging via the DEMO9S08QG8 evaluation board and standalone BDM interfaces like the USB-BDM-MULTI. Its Monitor ROM also enables basic debug via UART terminal (e.g., Tera Term) for memory inspection, register read/write, and FLASH programming - eliminating dependency on proprietary hardware during early firmware bring-up.
MCR908JK3EMDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 15
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCR908JK3EMDWE FAQ
1.How can I place an order for MCR908JK3EMDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCR908JK3EMDWE 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 MCR908JK3EMDWE reliable?
The price and inventory of MCR908JK3EMDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCR908JK3EMDWE is usually 5 days.
3.What payment methods are accepted for MCR908JK3EMDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCR908JK3EMDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCR908JK3EMDWE?
MCR908JK3EMDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCR908JK3EMDWE 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 MCR908JK3EMDWE?
For technical support, including MCR908JK3EMDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCR908JK3EMDWE requirements.
6.How does Aetrix verify that MCR908JK3EMDWE is sourced from the original manufacturer or authorized distributors?
All MCR908JK3EMDWE 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 MCR908JK3EMDWE meets industry standards.
7.What is the process for return or replacement of MCR908JK3EMDWE?
All MCR908JK3EMDWE units undergo pre-shipment inspection (PSI). If there is an issue with MCR908JK3EMDWE, 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 MCR908JK3EMDWE part is unused and in its original packaging.
Return procedure for MCR908JK3EMDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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