8-bit HC08 core with 8 MHz ceiling
The MC908QB4MDWER: It packs 4 KB of on-chip Flash program memory and 128 x 8 bytes of RAM — enough for small control loops, sensor readout, or simple communication stacks.
Peripherals and I/O budget
Thirteen general-purpose I/O lines are available, along with a 10-channel 10-bit ADC for analog inputs — enough to read a handful of sensors or potentiometers without an external converter. On-chip peripherals include low-voltage detect (LVD), power-on reset (POR), and a PWM module for dimming LEDs or driving small DC loads. Serial connectivity covers SCI (UART) and SPI, so it can talk to a host controller or a serial EEPROM.
The 1.27 mm pitch is friendly to hand-assembly and rework — a standard hot-air station with a fine nozzle can lift and replace this part without lifting pads, provided the board is preheated to 100°C to reduce thermal shock. Pin 1 is clearly marked by a notch on the package body and a dot on the top surface; no orientation ambiguity.