PRELIMINARY W541E20X

4-BIT FLASH EPROM MICROCONTROLLER

Publication Release Date: June 2003

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Revision A2

GENERAL DESCRIPTION

The W541E20X is fully compatible with W741E20X in terms of pin assignment and IC function. It is a

high-performance 4-bit microcontroller (

µC) that provides an flash EEPROM for the program memory.

The device contains a 4-bit ALU, two 8-bit timers, a divider, a serial port, and five 4-bit I/O ports

(including 3 output port for LED driving). There are also seven interrupt sources and 8-level subroutine

nesting for interrupt applications. The W541E20X has two power reduction modes, hold mode and

stop mode, which help to minimize power dissipation.

The W541E20X is suitable for end product manufacturer engineering testing and earlier samples

before mass production.

FEATURES

−5.5V

− Crystal/Ceramic oscillator: up to 4 MHz

− RC oscillator: up to 4 MHz

(32.768 KHz) oscillation must be determined by the code option

−2048 × 16 bit program flash EEPROM (including 2K × 4 bit look-up table)

−128 × 4 bit data RAM (including 16 working registers)

−Input/output ports: 4 ports/16 pins

−Serial input/output port: 1 port /4 pins (high sink current for LED driving)

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MFP output pin: 1 pin (MFP)

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Do not be floating when it is as input or output open-drain (NMOS type).

−Hold function: no operation (except for oscillator)

−Stop function: no operation (including oscillator)

−Five internal interrupts (Divider 0, Timer 0, Timer 1, and Serial I/O)

−Output is software selectable as modulating or nonmodulating frequency

−Works as frequency output specified by Timer 1