W65C21S Datasheet (WDC) - Peripheral Interface Adapter

W65C21S, Peripheral Interface Adapter

The WDC W65C21S is a very flexible Peripheral Interface Adapter (PIA) for use with WDC’s 65xx and other 8-bit microprocessor families.

The W65C21S provides programmed microprocessor control of up to two peripheral devices (Port A and Port B).

Peripheral device control is accomplished through two 8-b

The Western Design Center, Inc.

W65C21S Data Sheet www.DataSheet4U.com Peripheral Interface Adapter (PIA) W65C21S The Western Design Center W65C21S 1 The Western Design Center, Inc.

W65C21S Data Sheet WDC reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.

Information contained herein is provided gratuitously and without liability, to any user.

Reasonable efforts have been made to verify accuracy of the information

W65C21S Features

* The Western Design Center W65C21S 3 The Western Design Center, Inc. W65C21S Data Sheet www.DataSheet4U.com Figure 3. W65C21S PIA Block Diagram D0-D7 PHI2 RWB RS0 RS1 CS0 CS1 CS2B RESB IRQAB IRQBB VSS VCC (8) (8) PA0-PA7 CA1 CA2 PERIPHERAL DEVICE A 65xx, 68xx MICROPROCESSOR FAMILIES W65C21S