W78E52B-40 Winbond, W78E52B-40 Datasheet

W78E52B-40

Manufacturer Part Number

W78E52B-40

Description

8-BIT MTP MICROCONTROLLER

Manufacturer

Winbond

Datasheet

1.W78E52B-40.pdf (22 pages)

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GENERAL DESCRIPTION

The W78E52B is an 8-bit microcontroller which can accommodate a wider frequency range with low

power consumption. The instruction set for the W78E52B is fully compatible with the standard 8051.

The W78E52B 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 4-bit I/O port P4; three 16-

bit timer/counters; a hardware watchdog timer and a serial port. These peripherals are supported by

eight sources two-level interrupt capability. To facilitate programming and verification, the MTP-ROM

inside the W78E52B allows the program memory to be programmed and read electronically. Once

the code is confirmed, the user can protect the code for security.

The W78E52B 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

Wide supply voltage of 4.5V to 5.5V

256 bytes of on-chip scratchpad RAM

8 KB electrically erasable/programmable MTP-ROM

64 KB program memory address space

64 KB data memory address space

Four 8-bit bi-directional ports

One extra 4-bit bit-addressable I/O port, additional INT2 / INT3

(available on 44-pin PLCC/QFP package)

Three 16-bit timer/counters

One full duplex serial port(UART)

Eight sources, two-level interrupt capability

Built-in power management

Code protection mechanism

Packages:

Watchdog Timer

EMI reduction mode

DIP 40: W78E52B-24/40

PLCC 44: W78E52BP-24/40

PQFP 44: W78E52BF-24/40

8-BIT MTP MICROCONTROLLER

- 1 -

Preliminary W78E52B

Publication Release Date: December 1998

Revision A1

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