W921E400 Просмотр технического описания (PDF) - Winbond

Номер в каталоге

Компоненты Описание

Список матч

W921E400

4-BIT MICROCONTROLLER

Winbond 

W921E400A/W921C400

1. GENERAL DESCRIPTION

The W921E400A/W921C400 is a single-chip CMOS 4-bit microcontroller that is a subset of

W921E880A/W921C880. It features a 4-bit ALU, three multi-function timers, one channel DTMF

generator, a beep tone generator, a serial I/O port and built in four by one channel comparator circuit,

thus it can be easily implemented as telephone processor. Using the serial transmit/receive function,

the W921E400A/W921C400 series can interface with Winbond LCD driver IC by the serial control

circuit. There are also seven interrupt sources and 48-level subroutine nesting for interrupt

applications.

The W921E400A/W921C400 have two power reduction modes, hold mode and stop mode, which

help to minimize power dissipation. This product is a powerful microcontroller for telephone

processor, remote controllers, multiple I/O products, keyboard controllers, speech synthesis LSI

controllers, and other products with few components.

2. FEATURES

Operating Voltage

• 2.8 to 5.5V operating voltage for W921E400A EPROM TYPE

• 2.4 to 5.5V operating voltage for W921C400 MASK ROM TYPE

Operating Frequency

• Crystal or RC for main system clock:

− Crystal for 400K, 800K, 2M, 3.58M, 4 MHz

− RC up to 4 MHz

Memory

• 4K × 10-bit ROM (super EPROM):

• 512 × 4-bit RAM:

− 64 × 4-bit special register

− 16 × 4-bit working register

− 128 × 4-bit general register

− 304 × 4-bit multi-purpose register

Stack

• 8-bit stack pointer

I/O Pins

• 13 bidirectional and individually controllable I/O lines:

− P2 Port: P2.0 to P2.1 large sink current pins and open drain option

− P3 Port: P3.0 to P3.3 multi-function I/O

− P4 Port: P4.2 to P4.3 open drain and pull high resistor option, multi-function I/O

− P5 Port: P5.1 multi-function I/O

− P6 Port: P6.0 to P6.3 open drain and pull high resistor option, multi-function I/O

• 8 bidirectional I/O lines:

− PA Port: PA.0 to PA.3 open drain and pull high resistor option

− PB Port: PB.0 to PB.3 open drain and pull high resistor option

Publication Release Date: July 1999

-3-

Revision A3

Share Link: