W78L52
8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78L52 microcontroller supplies a wider frequency and supply voltage range than most 8-bit
microcontrollers on the market. It is compatible with the industry standard 80C52 microcontroller
series. The W78L52 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 8K byte mask ROM for application
programs.
The W78L52 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
· 8K 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: W78L52-24
- PLCC 44: W78L52P-24
- QFP 44: W78L52F-24
Publication Release Date: January 1999
- 1 -
Revision A2