The W78C33 is an 8-bit microcontroller with a wider frequency range than most 8-bit microcontrollers on the market. It is functionally compatible with the industry standard 80C32 microcontroller series except the one extra 4-bit bit-addressable I/O port (Port 4) and two additional external interrupts (INT2 , INT3 ).
The W78C33 is an 8‑bit CMOS microcontroller compatible with the 80C32 series, offering a wider frequency range, four 8‑bit bidirectional ports, an extra 4‑bit port, three 16‑bit timer/counters, and a full‑duplex serial port. It includes eight‑source, two‑level interrupt capability, built‑in power management, and ROMless operation.
The document provides pin configurations, functional descriptions, power‑down and idle modes, interrupt handling, absolute maximum ratings, and package options (PLCC44, QFP44, TQFP44). Contact information for Winbond worldwide is also listed.
| On‑chip RAM | 256 bytes |
|---|---|
| Program memory address space | 64 K bytes |
| Data memory address space | 64 K bytes |
| Maximum operating frequency | DC‑40 MHz |
| General‑purpose ports | Four 8‑bit bidirectional ports |
| Timer/counters | Three 16‑bit |
| Serial interface | One full‑duplex serial port |
| Interrupt capability | Eight‑source, two‑level |
| Power management | Built‑in power management |
| Extra I/O port | One 4‑bit bit‑addressable port (P4) |
| Additional external interrupts | INT2 and INT3 |
| Operating temperature | 70 °C |
| Supply voltage range | -0.3 V to +7.0 V |
The W78C33 operates up to DC‑40 MHz.
It provides 256 bytes of on‑chip scratchpad RAM.
Idle mode and power‑down mode are software selectable.
The device is available in PLCC‑44, QFP‑44, and TQFP‑44 packages.