The SH69P55A/K55A is a 4-bit microcontroller from Hitachi that has 8K ROM, 515 bytes RAM, 10-channel 10-bit ADC, two 8-bit and one 16-bit auto reload timers/counters, 10 system control registers, 376 data storage registers, 40 LCD data storage registers.
The SH69P55A/K55A is a CMOS 4‑bit microcontroller that integrates a CPU core, RAM, ROM, timers, LCD/LED drivers, 42 bidirectional I/O ports, a 10‑channel 10‑bit ADC, watchdog timer, low‑voltage reset and other peripherals. It is intended for applications such as washing machines and microwave ovens.
The manual provides detailed information on pin configurations for 28‑pin SOP, 32‑pin DIP and 44‑pin QFP packages, system registers, programming modes (including OTP for the SH69P55A), and electrical specifications such as operating voltage and clock ranges. This manual is written in Chinese.
| OOTP ROM size | 8K x 16 bits |
|---|---|
| MASKROM size | 8K x 16 bits |
| RAM size | 512 x 4 bits |
| System control registers | 99 |
| Data storage registers | 376 |
| LCD data storage registers | 40 |
| Operating voltage (low‑frequency range) | 2.4 V – 5.5 V (30 kHz – 4 MHz) |
| Operating voltage (high‑frequency range) | 4.5 V – 5.5 V (30 kHz – 8 MHz) |
| I/O ports | 42 bidirectional MO ports |
| Package options | 28‑pin SOP, 32‑pin DIP, 44‑pin QFP |
The device supports crystal resonators (32.768 kHz to 8 MHz), ceramic resonators (400 kHz to 8 MHz), external RC oscillators (400 kHz to 8 MHz) and an internal RC oscillator (4 MHz ±5%).
Only the SH69P55A variant supports OTP programming; the SH69K55A variant does not have an OTP programming mode.
The microcontroller provides 42 bidirectional MO ports.