The 38B4 group is the 8-bit microcomputer based on the 740 family core technology. The 38B4 group has six 8-bit timers, a 16-bit timer, a fluorescent display automatic display circuit, 12-channel 10-bit A-D converter, a serial I/O with automatic transfer function, which are available for controlling musical instruments and household appliances.
This handbook describes the Mitsubishi M38B4 single‑chip 8‑bit CMOS microcomputer. It includes functional block diagrams, pin configurations, and detailed pin descriptions for all 40 control pins. The document also lists part numbering, ROM and RAM size options, and package information.
Additional sections cover the CPU register structure, supported instructions, and planned product expansions. Revision history and safety notices are provided at the end of the document.
| Operating voltage | 4.0 V to 5.5 V |
|---|---|
| Operating temperature range | -20 °C to 85 °C |
| Number of control pins | 40 |
| Typical clock frequency | 2.0 MHz |
The device operates with a supply voltage of 4.0 V to 5.5 V.
It provides a total of 40 control pins.