16-bit CPU12 MCU for CAN-enabled control
The NXP MC9SDJ128BCFUR2 is a 16-bit microcontroller built around the CPU12 core, clocked at 50 MHz. It carries 128 KB of Flash program memory, 8K x 8 RAM, and 2K x 8 EEPROM — enough space for moderate control loops and a CAN communication stack. The 80-QFP package (14x14 mm body) gives access to 59 general-purpose I/O lines. On-chip peripherals include PWM and watchdog timer, an 8-channel 10-bit ADC, and serial interfaces: CANbus, I²C, SCI, and SPI. Supply range is 2.35 V to 5.25 V. The internal oscillator saves an external crystal in non-critical timing applications.
50 MHz bus — what it buys you on the CAN line
The 8K x 8 RAM limits buffering; if your application queues many CAN messages or runs a large state machine, watch the RAM budget. The 2K x 8 EEPROM is useful for calibration constants and fault logs that survive a power cycle.