W78L812A(2006) Просмотр технического описания (PDF) - Winbond

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W78L812A
(Rev.:2006)

8-BIT MICROCONTROLLER

Winbond 

W78LE812/W78L812A

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

x Fully static design 8-bit CMOS microcontroller

x Wide supply voltage of 2.4V to 5.5V

x 256 bytes of on-chip scratchpad RAM

x 8 KB electrically erasable/programmable Flash EPROM

x 64 KB program memory address space

x 64 KB data memory address space

x Four 8-bit bi-directional ports

x Three 16-bit timer/counters

x Timer 2 Clock-out

x One full duplex serial port (UART)

x Watchdog Timer

x Direct LED drive outputs

x Fourteen sources, two-level interrupt capability

x Wake-up via external interrupts at Port 1

x EMI reduction mode

x Built-in power management

x Code protection mechanism

x Packages:

− Lead Free (RoHS) DIP 40: W78L812A24DL

− Lead Free (RoHS) PLCC 44: W78L812A24PL

− Lead Free (RoHS) PQFP 44: W78L812A24FL

− Lead Free (RoHS) LQFP 48: W78L812A24LL

Publication Release Date: November 6, 2006

-3-

Revision A9

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