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NXP Semiconductors MC908SR12MFAER
- Part No.:
- MC908SR12MFAER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
MC908SR12MFAER.pdf
- Description:
- IC MCU 8BIT 12KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,294
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Product details
Overview
MC908SR12MFAER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 12 KB on-chip FLASH, 512 B RAM, a 10-bit ADC with 8 channels, two 16-bit TIM modules, PWM, SCI, and I²C interfaces. It operates from 2.7–5.5 V, supports PLL-based clock generation up to 8 MHz bus speed, and targets embedded control in industrial sensors and motor drives.
For engineers reviewing the MC908SR12MFAER datasheet, MC908SR12MFAER pinout, MC908SR12MFAER application, or MC908SR12MFAER equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for design-in and supply continuity.
Technical Context
The MC908SR12MFAER integrates an HCS08 CPU core with a programmable PLL enabling flexible bus clock derivation from internal RC or external crystal sources. Its analog subsystem includes a temperature sensor, current-detect amplifier, and configurable 10-bit ADC with auto-scan mode across eight inputs.
Dual 16-bit timer modules support input capture, output compare, and buffered/unbuffered PWM generation. The device implements a multi-master I²C interface (MMIIC), full-duplex SCI, and keyboard interrupt (KBI) module - all managed via dedicated SIM and interrupt status registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address space and indexed addressing mode support |
| FLASH Memory | 12 KB on-chip FLASH with block protection, mass/sector erase, and in-system programming capability |
| RAM Size | 512 bytes of on-chip RAM with retention during Stop mode |
| ADC Resolution | 10-bit successive-approximation ADC with 8 selectable inputs and auto-scan mode |
| Bus Clock Speed | Up to 8 MHz derived from PLL (4× crystal or RC source); supports 1–8 MHz range for timing-critical peripherals |
| Supply Voltage | 2.7–5.5 V operation - enables direct interface with 3.3 V and 5 V logic systems without level shifters |
| I/O Pins | 34 general-purpose I/O pins across Ports A–D, including open-drain capable pins for I²C bus implementation |
Pinout & Package
MC908SR12MFAER is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm lead pitch and exposed thermal pad. Package dimensions are 10 × 10 mm, compliant with JEDEC MS-026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Digital core power and return; decoupling required within 10 mm of pins |
| VDDA, VSSA | Analog power and ground | Independent analog domain supply for ADC, analog module, and PLL - must be filtered separately |
| OSC1, OSC2 | Crystal oscillator terminals | Supports 1–8 MHz fundamental-mode crystals; internal load capacitors configurable via register |
| RST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external push-button or supervisor IC assertion |
| PTA0–PTA7 | Port A bidirectional I/O | Includes IRQ1, KBI0–KBI3, and TIM channel functions; PTA1/PTA2 used for monitor mode entry |
| PTB0–PTB6 | Port B bidirectional I/O | Includes SDA0/SCL0 (I²C), SDA1/SCL1 (secondary I²C), and SCI TxD/RxD - all open-drain capable |
| PTC0–PTC7 | Port C bidirectional I/O | Supports TIM channel functions, PWM outputs, and ADC analog inputs (PTC0–PTC3) |
| PTD0–PTD7 | Port D bidirectional I/O | KBI4–KBI7 inputs; also used for ADC reference (VREFH/VREFL) and analog monitoring (OPIN1/OPIN2) |
Key Features
| Feature | Design Value |
|---|---|
| PLL-based clock generation | Enables precise bus clock scaling from low-frequency crystals or RC oscillators - critical for EMI reduction and power optimization |
| Integrated analog subsystem | Combines 10-bit ADC, on-chip temperature sensor, and current-flow detection amplifier - eliminates need for external signal conditioning in motor feedback loops |
| Monitor ROM (MON) | On-chip 1 KB ROM supporting serial bootloader via SCI at 9600–115.2 kbps - enables field firmware updates without external programmer |
| Dual 16-bit TIM modules | Each supports input capture, output compare, and PWM with independent prescalers - allows simultaneous motor phase control and encoder counting |
| Multi-master I²C interface | Hardware-implemented MMIIC module with arbitration, clock stretching, and slave address recognition - simplifies sensor network integration |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop DC brush motor control with hall-effect encoder feedback and current sensing. IC Role / Device Role / Timing Role: Main system controller executing PID loop, generating complementary PWM outputs, sampling ADC for current/voltage, and managing I²C sensor data. Use Value: Integrated ADC, dual TIM, and current-detect amplifier reduce BOM count by three discrete components versus generic MCU solutions. |
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity (via I²C), and supply voltage. IC Role / Device Role / Timing Role: System manager handling sensor polling, low-power wake-up via KBI, ADC conversion, and SCI-based data reporting. Use Value: On-chip temperature sensor and ultra-low Stop-mode current (1 µA typical) extend battery life beyond 2 years in periodic-readout applications. |
| Appliance User Interface | Power Supply Monitoring |
Use Scenario: Keypad scanning and LED display driving in microwave oven or washing machine control panel. IC Role / Device Role / Timing Role: Dedicated KBI module scans 8×8 matrix; PWM dimming controls LED backlight; SCI communicates with main controller. Use Value: Hardware KBI offloads CPU from polling, while buffered PWM ensures flicker-free LED intensity control without software intervention. |
Use Scenario: Real-time monitoring of AC/DC converter rail voltages and overcurrent events in telecom power supplies. IC Role / Device Role / Timing Role: ADC measures VREFH/VREFL-ratio scaled inputs; current-detect amplifier triggers IRQ on fault; SCI reports status to host. Use Value: Analog module's dedicated current-detect path provides <1 µs response to overcurrent - faster than software-based threshold checking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S08QG8CDTE | 8 KB FLASH, 512 B RAM, same HCS08 core but no PLL; max 8 MHz bus clock only from crystal/RC without multiplication | Lacks PLL-based clock flexibility and integrated current-detect amplifier - requires external comparator for overcurrent detection | Select when cost sensitivity outweighs need for dynamic clock scaling or analog feature integration |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB FLASH, 16 KB RAM, 12-bit ADC, but no on-chip temperature sensor or current-detect amplifier | Higher performance and memory, yet lacks analog subsystem features native to MC908SR12MFAER - increases external component count for same analog functions | Choose for applications requiring >8 MHz throughput or RTOS support, accepting added analog signal chain complexity |
Compared with MC908SR12MFAER, MC9S08QG8CDTE offers lower cost but sacrifices PLL flexibility and analog integration, while S9KEAZ128AMLH delivers higher compute headroom at the expense of analog feature density and legacy toolchain compatibility.
Availability
MC908SR12MFAER is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, appliance UIs, and power supply monitoring requiring stable component supply across long-lifecycle programs.
Supply support for MC908SR12MFAER 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The MC908SR12MFAER belongs to the HCS08 microcontroller family, designed specifically for cost-sensitive, resource-constrained embedded control applications demanding integrated analog functionality and robust real-time performance.
FAQ
What is the maximum bus clock frequency supported by the MC908SR12MFAER?
The MC908SR12MFAER supports a maximum bus clock frequency of 8 MHz. This is achieved using the on-chip PLL configured for 4× multiplication of a 2 MHz crystal or RC oscillator source. Electrical specifications in Table 24-4 confirm stable operation up to 8 MHz at 4.5–5.5 V, with derating to 4 MHz at 2.7–3.6 V per the 3V DC characteristics table.
Does the MC908SR12MFAER include a hardware bootloader?
Yes, the MC908SR12MFAER includes a 1 KB Monitor ROM (MON) that implements a serial bootloader accessible via the SCI interface. It supports standard ASCII commands for flash programming, memory read/write, and security lock operations - enabling field firmware updates without external programming hardware. Entry is triggered by asserting RST while holding PTA1 and PTA2 low during power-up.
How many ADC input channels does the MC908SR12MFAER support?
The MC908SR12MFAER supports eight ADC input channels. These are mapped to PTC0–PTC3 (four pins), PTD0–PTD3 (four pins), plus OPIN1 and OPIN2 - with multiplexing controlled by the ADASCR register. The 10-bit successive-approximation ADC achieves 100 ksps maximum sample rate and supports both single-conversion and auto-scan modes.
What analog features beyond the ADC are integrated into the MC908SR12MFAER?
Beyond the 10-bit ADC, the MC908SR12MFAER integrates an on-chip temperature sensor, a two-stage analog amplifier, and a dedicated current-flow detection amplifier with programmable trip point. The current-detect amplifier drives a digital output directly usable as an IRQ source, enabling sub-microsecond overcurrent response without CPU intervention - confirmed in Section 14.4.4 and Table 24-13.
Is the MC908SR12MFAER pin-compatible with other HCS08 family members?
No, the MC908SR12MFAER is not pin-compatible with other HCS08 devices such as the MC9S08QG8 or MC9S08AW60. Its 44-pin QFP package and specific pin assignments - including dual I²C ports (SDA0/SCL0 and SDA1/SCL1), dedicated CGMXFC filter capacitor pin, and analog-specific pins (VREFL, VREFH, OPIN1, OPIN2) - are unique to the SR12 family. Pin compatibility is not claimed in the datasheet or Freescale/NXP migration guides.
MC908SR12MFAER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, SCI
- Peripherals:
- LVD, POR, PWM, Temp Sensor
- Number of I/O:
- 31
- Program Memory Size:
- 12KB (12K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 14x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908SR12MFAER FAQ
1.How can I place an order for MC908SR12MFAER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908SR12MFAER 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 MC908SR12MFAER reliable?
The price and inventory of MC908SR12MFAER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908SR12MFAER is usually 5 days.
3.What payment methods are accepted for MC908SR12MFAER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908SR12MFAER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908SR12MFAER?
MC908SR12MFAER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908SR12MFAER 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 MC908SR12MFAER?
For technical support, including MC908SR12MFAER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908SR12MFAER requirements.
6.How does Aetrix verify that MC908SR12MFAER is sourced from the original manufacturer or authorized distributors?
All MC908SR12MFAER 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 MC908SR12MFAER meets industry standards.
7.What is the process for return or replacement of MC908SR12MFAER?
All MC908SR12MFAER units undergo pre-shipment inspection (PSI). If there is an issue with MC908SR12MFAER, 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 MC908SR12MFAER part is unused and in its original packaging.
Return procedure for MC908SR12MFAER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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