W78L54

8-BIT MICROCONTROLLER

Publication Release Date: Sep. 1998

- 1 -

Revision A0

GENERAL DESCRIPTION

The W78L54 microcontroller supplies a wider frequency and supply voltage range than most 8-bit

microcontrollers on the market. It is compatible with the industry standard 80C54 microcontroller

series. The W78L54 contains four 8-bit bidirectional parallel ports, one extra 4-bit bit-addressable I/O

watchdog timer and a serial port. These peripherals are supported by a eight-source, two-level

interrupt capability. There are 256 bytes of RAM and an 16K byte mask ROM for application

programs.

The W78L54 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

• Supply voltage of 1.8V to 5.5V

• Watchdog timer

• EMI reduction mode

− DIP 40: W78L54-24

− PLCC 44: W78L54P-24

− QFP 44: W78L54F-24