The 3803 series is a 8-bit microcomputer based on the 740 family core technology. It is designed for household products, office automation equipment and controlling systems that require analog signal processing, including the A/D converter and D/A converters.
The 3803 Group (Spec.L) is a single‑chip 8‑bit CMOS microcomputer designed for household products, office automation and control systems. It integrates basic machine‑language instructions, programmable I/O, built‑in A/D and D/A converters, timers, PWM, a 21‑source interrupt controller and a watchdog timer.
The device is offered in 64‑pin plastic‑molded SDIP, LQFP and FLGA packages. It operates up to 16.8 MHz clock frequency, provides 60 KB of ROM (mask or flash) and 2 KB of RAM, and includes detailed pin‑out diagrams and performance tables throughout the document.
| Number of basic instructions | 71 |
|---|---|
| Minimum instruction execution time | 0.24 µs (at 16.8 MHz) |
| Maximum oscillation frequency | 16.8 MHz |
| ROM size (Mask ROM version) | 60 KB |
| RAM size | 2048 bytes |
| I/O ports | 56 pins |
| Interrupt sources | 21 sources, 16 vectors |
| Timer configuration | 8‑bit ×4 (with prescaler), 16‑bit ×1 |
| Serial interface | 8‑bit ×2 (UART or clock‑synchronized) |
| PWM outputs | 8‑bit ×1 (clock‑synchronized) and 8‑bit ×1 (with prescaler) |
| A/D converter | 10‑bit ×16 channels (8‑bit reading enabled) |
| D/A converter | 8‑bit ×2 channels |
| Watchdog timer | 16‑bit ×1 |
| LED direct‑drive port | 8 LEDs (15 mA avg, 30 mA peak, 90 mA total) |
| Operating temperature range | -20 °C to 85 °C |
| Package types | 64‑pin plastic‑molded SDIP / LQFP / FLGA |
The device operates up to 16.8 MHz.
It provides 60 KB of mask ROM.
The microcontroller offers 56 I/O pins.