MC68HC908SR12CFA
MC68HC908SR12CFA - 8MHz 8-Bit HC08 MCU 12KB FLASH 48-LQFP | NXP
The NXP MC68HC908SR12CFA is an 8-bit HC08-family microcontroller with 12KB of on-chip FLASH program memory and 512 bytes of RAM, operating at a bus frequency of 8MHz from a 48-pin LQFP (7x7mm) package. It features 31 general-purpose I/O lines, an internal oscillator, and on-chip analog/peripheral integration that includes a 10-bit ADC, programmable amplifier, temperature sensor, current sensor, PWM, SMBus, I2C, and a clock generator module with PLL. According to the NXP MC68HC908SR12 datasheet, this part targets cost-sensitive embedded applications that need an integrated analog front end and SMBus connectivity without external components.
What is an HC08 microcontroller? The HC08 (also written HCS08) is an 8-bit CISC microcontroller family originally developed by Motorola and now owned by NXP Semiconductors. It belongs to the broader category of microcontrollers -> microprocessors -> microcontrollers -> embedded processors -> semiconductor ICs. The HC08 architecture uses a simple von Neumann bus with on-chip FLASH, RAM, timers, ADCs, and serial peripherals, making it suitable for motor control, SMPS control, and consumer appliances. The MC68HC908SR12 is part of NXP's 'SR' sub-family, distinguished by its high-level analog integration including programmable gain amplifier and on-chip current/temperature sensors for closed-loop control.
Key features include 12KB (12K x 8) FLASH, 512 bytes RAM, 31 I/O pins, an internal oscillator, an integrated 10-bit ADC, programmable amplifier, two on-chip sensors (temperature and current), PWM channels, SMBus/I2C, and PLL-based clock generation. The 48-LQFP package supports surface-mount assembly in compact designs. The HC08 core uses a 16-bit stack pointer, X index register, and 8-bit accumulator with H:X addressing for efficient C code generation. Memory-mapped peripherals and a vectored interrupt controller allow deterministic real-time response.
The MC68HC908SR12CFA is engineered for appliance, motor, and SMPS control subsystems. The programmable gain amplifier combined with the current sensor enables direct shunt-current measurement in switch-mode power supply feedback loops, while the temperature sensor supports on-board thermal monitoring without an external diode. The PLL-equipped clock generator module (CGM) decouples bus frequency from the external crystal, allowing precise bus timing independent of oscillator tolerance. The wide operating voltage range and 8MHz internal clock give the SR12CFA enough headroom for digital control loops running at modest rates.
Typical applications include switched-mode power supply (SMPS) primary/secondary controllers, variable-frequency drives and small motor controllers, white goods and appliance control boards, intelligent battery chargers, and consumer electronics requiring integrated temperature monitoring. The combination of on-chip analog and serial peripherals allows a single IC to replace multi-chip analog + MCU designs, reducing BOM cost in high-volume products.
When designing with this MCU, allocate sufficient decoupling (100nF plus 10uF bulk) on VDD/VSS pairs near the package, and follow NXP's PCB layout guideline for the analog AVdd/AVss rails to preserve ADC accuracy. Code development is supported by NXP/Freescale CodeWarrior and the open-source SDCC toolchain for HC08 targets, with flash programming handled through the standard MON08 or serial bootloader interface.
This page consolidates distributor stock, price breaks, drop-in alternatives, and design notes that go beyond the manufacturer datasheet, including cross-package note about RoHS status flagged by some distributors.
RFQ
संपर्क
