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
port (Port 4) and two additional external interrupts (
INT2
, INT3 ), three 16-bit timer/counters, one
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
16
K 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
Two additional external interrupts
INT2
/ INT3
Watchdog timer
EMI reduction mode
Built-in power management
Code protection
Packages:
-
DIP 40: W78L54-24
-
PLCC 44: W78L54P-24
-
QFP 44: W78L54F-24
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