Rainbow Electronics W78C801 - Manual

W78C801
8-BIT MICROCONTROLLER
Publication Release Date: February 1999
- 1 - Revision A3
GENERAL DESCRIPTION
The W78C801 is an 8-bit microcontroller which can accommodate a wide frequency range with low
power consumption. The instruction set for the W78C801 is fully compatible with the standard 8051.
The W78C801 contains an 4K bytes Mask ROM; a 256 bytes RAM; four 8-bit bi-directional and bit-
addressable I/O ports; an additional 6-bit I/O port P4; two 16-bit timer/counters; a hardware watchdog
timer. These peripherals are supported by a twelve sources two-level interrupt capability. The
W78C801 does not contain serial port.
The W78C801 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 8-bit CMOS microcontroller
• DC-40 MHz operation
• 256 bytes of on-chip scratchpad RAM
• 4 KB Mask-ROM
• 64 KB program memory address space
• 64 KB data memory address space
• Four 8-bit bi-directional ports
• Two 16-bit timer/counters
• Watchdog Timer
• Direct LED drive outputs
•
Twelve sources, two-level interrupt capability
• Wake-up via external interrupts at Port 1
• EMI reduction mode
•
Built-in power management
• Code protection mechanism
• Packages:
− DIP 40: W78C801-24/40
− PLCC 44: W78C801P-24/40
− PQFP 44: W78C801F-24/40