w65c21.pdf

June 19, 2009

W65C21

(W65C21N and W65C21S)

Peripheral Interface Adapter (PIA)

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 but no guarantee whatsoever is given as to the accuracy or as

to its applicability to particular uses. In every instance, it must be the responsibility of the

user to determine the suitability of the products for each application. WDC products are

not authorized for use as critical components in life support devices or systems. Nothing

contained herein shall be construed as a recommendation to use any product in violation

of existing patents or other rights of third parties. The sale of any WDC product is subject

to all WDC Terms and Conditions of Sales and Sales Policies, copies of which are

available upon request.

including the right of reproduction in whole or in part in any form.

INTRODUCTION

The WDC W65C21 (W65C21N and W65C21S) is a very flexible Peripheral Interface Adapter (PIA) for

use with WDC’s 65xx, 68xx, and other 8-bit microprocessor families. The W65C21 provides programmed

microprocessor control of up to two peripheral devices (Port A and Port B). Peripheral device control is

accomplished through two 8-bit bidirectional I/O Ports, with individually designed Data Direction

Registers. The Data Direction Registers provide selection of data flow direction (input or output) at each

respective I/O Port. Data flow direction may be selected on a line-by-line basis with intermixed input and

output lines within the same port. The “handshake” interrupt control feature is provided by four peripheral

control lines. This capability provides enhances control over data transfer functions between the

microprocessor and peripheral devices, as well as bidirectional data transfer between W65C21 Peripheral

Interface Adapters in multiprocessor systems.

FEATURES

• Low Power CMOS N-well silicon gate technology

• The W65C21N is plug replacement of NMOS and CMOS 6521 and 6821 devices with current

limiting resistors

• The W65C21S is lower power, faster and direct drive outputs with no current limiting resistors.

• High speed/Low power replacement for Motorola/Rockwell/AMI/MOS

Technology/MOSTEK/HITACHI/ ST Microelectronics/GTE/CMD 6520, 6521, 6820, 6821 PIA’s

• Two 8-bit bidirectional I/O ports with individual data direction control.

• Automatic “Handshake” control of data transfers

• Two interrupts (one for each port) with program control

• Static to 14MHz operation, with high speed Port A, CA2 outputs.

• Industrial temperature range

• 40 Pin Plastic DIP and 44 Pin Plastic PLCC versions

• 5 volt ± 10% supply requirements

• Compatible with the 65xx and 68xx family of microprocessors

Figure 1 44 Pin PLCC Pin Configuration

Figure 2 40 Pin DIP Pin Configuration

IRQAB

CA1

INTERUPT STATUS

CONTROL A (ISCA)

CA2

CON TRO L

(CRA )

DATA DIRECTION

(DDRA)

DATA BUS

BUFFER

(D BB )

OUTPUT BUS

PA0

PA1

PA2

PA3

PA4

PA5

PA6

PA7

PE RI PH E RA L

OUTPUT

(O RA )

PE RI PH E RA L

INTERFACE

BUFFER A

(PIBA)

DATA INPUT

(DIR)

PE RI PH E RA L

OUTPUT

(O RB )

PERI PH ERA L

INTERFACE

BUFFER B

(PIBB)

PB0

PB1

PB2

PB3

PB4

PB5

PB6

PB7

CS 0

CS 1

CS2B

RS 0

RS 1

RWB

PHI2

RESB

CHIP

SELECT

& RW B

CONTROL

IN PU T BU S

DATA DIRECTION

(DD RB)

CON TRO L

(CRB)

CB1

CB2

IRQBB

INTERRUPT STATUS

CO NTRO L B (ISCB )

Figure 3 W65C21 PIA Block Diagram

Figure 4 Interface Signals Relationship

A BSOLUTE MAXIMUM RATINGS*

Parameter

Symbol

Value

Unit

Supply Voltage

V DD

-0.3 to +7.0

Vdc

Input Voltage

V IN

-0.3 to V DD +0.3

Vdc

Output Voltage

V OUT

-0.3 to V DD +0.3

Vdc

Operating Temp.

Range - Industrial

T A

-40 to +85

°C

Storage

Temperature

T STG

-55 to +150

°C

This device contains input protection against damage due to high static voltages or electric fields; however,

precautions should be taken to avoid application of voltages higher than the maximum rating.

Notes:

1. Exceeding these ratings may cause permanent damage; functional operation under these conditions is not

implied.

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