The W78E52 is an 8‑bit CMOS microcontroller with a flash EEPROM that replaces the mask ROM of the W78C52. It offers a wide frequency range, four 8‑bit bidirectional I/O ports, three 16‑bit timer/counters, a full‑duplex serial port, and two power‑reduction modes (idle and power‑down). The device includes 256 bytes of on‑chip RAM and an 8 KB flash EEPROM for application programs.
The handbook details pin configurations for both 40‑pin DIP and 44‑pin PLCC packages, describes normal and flash operating modes, and lists absolute maximum ratings, power‑management features, and typical application circuits. Electrical specifications such as operating temperature, storage temperature, and voltage limits are also provided.
| Microcontroller type | 8-bit CMOS |
|---|---|
| On‑chip RAM | 256 bytes |
| Flash EEPROM size | 8 KB |
| Program memory address space | 64 KB |
| Data memory address space | 64 KB |
| I/O ports | Four 8‑bit bidirectional ports |
| Timers/counters | Three 16‑bit timer/counters |
| Serial interface | One full‑duplex serial port |
| Maximum operating frequency | DC‑40 MHz |
| Operating temperature range | 0 °C to 70 °C |
The W78E52 contains an 8 KB electrically erasable/programmable EPROM.
It provides four 8‑bit bidirectional ports.
The microcontroller has two power‑reduction modes: idle mode and power‑down mode.
The device can operate up to DC‑40 MHz.