Preliminary W78C33B

8-BIT MICROCONTROLLER

Publication Release Date: June 1998

- 1 -

Revision A1

GENERAL DESCRIPTION

The W78C33B microcontroller supplies a wider frequency range than most 8-bit microcontrollers on

the market. It is functional compatible with the industry standard 80C32 microcontroller series except

the one extra 4-bit bit-addressable I/O port (Port 4).

The W78C33B contains four 8-bit bidirectional parallel ports, three 16-bit timer/counters, and a serial

port. These peripherals are supported by a six-source, two-level interrupt capability. There are 256

bytes of RAM, and the device supports ROMless operation for application programs.

The W78C33B 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.

FEATURES

− PLCC 44: W78C33BP-24/40

− QFP 44: W78C33BF-24/40

− TQFP 44: W78C33BM-24/40