W78LE812
8-BIT MTP MICROCONTROLLER
GENERAL DESCRIPTION
The W78LE812 is an 8-bit microcontroller which can accommodate a wide range of supply voltages
with low power consumption. The instruction set for the W78LE812 is fully compatible with the
standard 8051. The W78LE812 contains an 8K bytes MTP ROM (Multiple-Time Programmable
ROM); a 256 bytes RAM; four 8-bit bi-directional and bit-addressable I/O ports; an additional 6-bit I/O
port P4; three 16-bit timer/counters; a hardware watchdog timer and a serial port. These peripherals
are supported by a fourteen sources two-level interrupt capability. To facilitate programming and
verification, the MTP-ROM inside the W78LE812 allows the program memory to be programmed and
read electronically. Once the code is confirmed, the user can protect the code for security.
The W78LE812 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
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Wide supply voltage of 2.4V to 5.5V
•
256 bytes of on-chip scratchpad RAM
•
8 KB electrically erasable/programmable MTP-ROM
•
64 KB program memory address space
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64 KB data memory address space
•
Four 8-bit bi-directional ports
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Three 16-bit timer/counters
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Timer 2 Clock-out
•
One full duplex serial port(UART)
•
Watchdog Timer
•
Direct LED drive outputs
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Fourteen sources, two-level interrupt capability
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Wake-up via external interrupts at Port 1
•
EMI reduction mode
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Built-in power management
•
Code protection mechanism
•
Packages:
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DIP 40: W78LE812-24
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PLCC 44: W78LE812P-24
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PQFP 44: W78LE812F-24
-1-
Publication Release Date: February 1999
Revision A2
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