This document describes the features and characteristics of the 38C3 group, including basic machine language instructions, memory size, programmable input/output ports, interrupts, timers, A-D converter, serial I/O, etc.
The 38C3 Group is an 8‑bit CMOS microcomputer family based on the 740 core technology. It integrates an LCD drive control circuit, a 10‑channel 10‑bit A‑D converter, serial I/O, multiple timers and up to 57 programmable I/O ports. The family offers variations in internal memory size and package types.
Key specifications include a minimum instruction execution time of 0.5 µs at 8 MHz, ROM sizes from 4 KB to 48 KB, RAM from 192 B to 1 KB, and power‑supply ranges of 2.5 V–5.5 V (low‑speed) up to 4.0 V–5.5 V (high‑speed). The devices operate from –20 °C to 85 °C and are intended for cameras, household appliances and other consumer electronics.
| Minimum instruction execution time | 0.5 µs (at 8 MHz) |
|---|---|
| ROM size | 4 KB to 48 KB |
| RAM size | 192 B to 1 KB |
| Programmable I/O ports | 57 |
| A‑D converter channels | 10‑bit, 8‑channel |
| High‑speed power supply voltage | 4.0 V to 5.5 V |
| Power dissipation (high‑speed) | 32 mW (at 8 MHz) |
| Operating temperature range | –20 °C to 85 °C |
The minimum instruction execution time is 0.5 µs when the device runs at an 8 MHz clock.
ROM sizes range from 4 KB to 48 KB and RAM sizes from 192 bytes to 1 KB.
The family offers up to 57 programmable input/output ports.