CDP1855_1 datasheet(9/16 Pages) INTERSIL

Part #	CDP1855

Description	8-Bit Programmable Multiply/Divide Unit

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Manufacturer	INTERSIL [Intersil Corporation]

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9

CDP1855 Interfacing Schemes

FIGURE 3. REQUIRED CONNECTION FOR MEMORY MAPPED

ADDRESSING OF THE MDU

FIGURE 4. INTERFACING THE CDP1855 TO AN 8085 MICRO-

PROCESSOR AS AN I/O DEVICE

Programming Example for Multiplication

For a 24-bit x 24-bit multiply using the system shown in Figure 5, the following is an assembly listing of a program to multiply 201F7C16 by

723C0916:

MEMORY

LOCATION

OP

CODE

LINE

NO.

ASSEMBLY LANGUAGE

0000

F830;

0001

LDI 030H

0002

A2;

0002

PLO R2

. . LOAD 30 INTO R2.0

0003

F800;

0003

LDI 00H

0005

B2;

0004

PHI R2

. . LOAD 00 INTO R2.1 (R2=0030)

0006

6758;

0005

OUT 7;

DC 058H

. . LOAD CONTROL REGISTERS

0008

;

0006

. . SPECIFYING THREE MDU’s

0008

;

0007

. . RESET THE Y REGISTER AND

0008

;

0008

. . SEQUENCE COUNTER

0008

6420;

0009

OUT 4;

DC 020H

. . LOAD MSB OF X REGISTER

000A

;

0010

. . WITH 20

000A

641F;

0011

OUT 4;

DC 01FH

. . LOAD NEXT MSB OF X REG

000C

;

0012

. . WITH 1F

000C

647C;

0013

OUT 4;

DC 07CH

. . LOAD LSB OF X REGISTER

000E

;

0014

. . WITH 7C

000E

6572;

0015

OUT 5;

DC 072H

. . LOAD MSB OF Z REGISTER

0010

;

0016

. . WITH 72

CLEAR

XTAL

MA0

MA1

MAX

TPA

MWR

MRD

TPB

EF

BUS

HIGH

ADDRESS

LATCH

CDP1802

CLEAR

CLOCK

CI

CN0

CN1

YL

ZR

CTL

YR

ZL

BUS

CDP1855

RA0

RA1

RE/WE

CE

STB

CO

RA2

+VDD

CI

BUS 0

15

BUS 1

16

BUS 2

17

BUS 3

18

BUS 4

19

BUS 5

20

BUS 6

21

BUS 7

22

ZR

23

YL

5

CTL

3

ZL

6

YR

24

CE

RA0

RA1

RA2

1

13

12

11

STB

RD/WE

CLK

CLEAR

9

10

8

2

CN1

CN0

VDD

VSS

25

26

27

28

14

A8

A9

IO/M

WR

CLK (OUT)

RD

DATA BUS

DATA

BUS

RESET OUT

1/4 CD4011

VCC

CDP1855

MDU

CDP1855, CDP1855C

Similar Part No. - CDP1855_1

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	CDP1855C	85Kb / 15P	8-Bit Programmable Multiply/Divide Unit March 1997
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CDP1855 Datasheet(PDF) 9 Page - Intersil Corporation

CDP1855 Datasheet(HTML) 9 Page - Intersil Corporation

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