The W78E54 is an 8-bit microcontroller that is functionally compatible with the W78C54, except that the mask ROM is replaced by a flash EEPROM with a size of 16 KB. To facilitate programming and verification, the flash EEPROM inside the W78E54 allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security. The W78E54 microcontroller supplies a wider frequency range than most 8-bit microcontrollers on the market. It is functionally compatible with the industry-standard 80C52 microcontroller series, except that one extra 4-bit bit-addressable I/O port (Port 4) and two additional external interrupts (INT2 , INT3 ). The W78E54 contains four 8-bit bidirectional and bit-addressable I/O ports, three 16-bit timer/counters, and a serial port. These peripherals are supported by a eight-source, two-level interrupt capability. There are 256 bytes of RAM and an 16 KB flash EEPROM for application programs. The W78E54 microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode turns off the processor clock but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor.
The W78E54 is an 8‑bit CMOS microcontroller with a 16 KB flash EEPROM, 256 bytes of RAM, four 8‑bit I/O ports plus an extra 4‑bit port, three 16‑bit timer/counters and a full‑duplex serial port. It operates from DC‑40 MHz and offers idle and power‑down power‑reduction modes.
The manual includes a general description, pin configuration tables, functional description, timing and clock information, power‑management details, package options (DIP‑40, PLCC‑44, QFP‑44, TQFP‑44) and mechanical dimensions.
| Microcontroller type | 8-bit CMOS |
|---|---|
| Flash EEPROM size | 16 KB |
| Program memory address space | 64 KB |
| Data memory address space | 64 KB |
| On‑chip RAM | 256 bytes |
| Timer/counters | Three 16‑bit |
| Serial port | One full‑duplex |
| Operating frequency range | DC‑40 MHz |
| Power reduction modes | Idle mode, Power‑down mode |
| Package types | DIP‑40, PLCC‑44, QFP‑44, TQFP‑44 |
The W78E54 contains a 16 KB flash EEPROM.
The microcontroller supports idle mode and power‑down mode.