w78l812a Winbond Electronics Corp America, w78l812a Datasheet - Page 3

• Manufacturer Part Number: w78l812a
• Description: 8-bit Mcu Series 80c51-based
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
The W78L812 is an 8-bit microcontroller which can accommodate a wide range of supply voltages
with low power consumption. The instruction set for the W78L812 is fully compatible with the standard
8051. The W78L812 contains an 8K bytes Flash EPROM; a 256 bytes RAM; four 8-bit bi-directional
and bit-addressable I/O ports; an additional 5-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 Flash EPROM inside the W78L812
allows the program memory to be programmed and read electronically. Once the code is confirmed,
the user can protect the code for security.
The W78L812 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.
2. FEATURES
Fully static design 8-bit CMOS microcontroller
Wide supply voltage of 2.4V to 5.5V
256 bytes of on-chip scratchpad RAM
8 KB electrically erasable/programmable
64 KB program memory address spa
64 KB data memory address s
Four 8-bit bi-directional ports
Three 16-bit timer/counters
Timer 2 Clock-out
One full duplex serial port
Watchdog Timer
Direct LED drive outputs
Fourteen sources, two-level i
Wake-up via external interrup
EMI reduction
Built-in power management
Code protection mechanism
Packages:
− Lead Free (RoHS) DIP 40:
− Lead Free (RoHS) PLCC 44: W78L812A24PL
− Lead Free (RoHS) PQFP 44: W78L812A24FL
− Lead Free (RoHS) LQFP 48: W78L812A24LL
mode
(UART)
nterrupt capability
ts at Port 1
pace
W78L812A24DL
ce
Flash EPROM
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Publication Release Date: November 6, 2006
W78LE812/W78L812A
Revision A9