Winbond Electronics W78L54P-24, W78L54F-24, W78L54-24 Datasheet

W78L54

INT2

INT2

8-BIT MICROCONTROLLER

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

port (Port 4) and two additional external interrupts (
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

• Fully static design

• Supply voltage of 1.8V to 5.5V

• DC-24 MHz operation

• 256 bytes of on-chip scratchpad RAM

• 16K bytes of on-chip mask ROM

• 64K bytes program memory address space

• 64K bytes data memory address space

• Four 8-bit bidirectional ports

• Three 16-bit timer/counters

• One full duplex serial port

• Eight-source, two-level interrupt capability

• One extra 4-bit bit-addressable I/O port

, INT3), three 16-bit timer/counters, one

• Two additional external interrupts

• Watchdog timer

• EMI reduction mode

• Built-in power management

• Code protection

• Packages:

− DIP 40: W78L54-24

− PLCC 44: W78L54P-24

− QFP 44: W78L54F-24

/ INT3

Publication Release Date: Sep. 1998

- 1 - Revision A0

W78L54

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