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CDP1855 Datasheet(PDF) 10 Page - Intersil Corporation

Part # CDP1855
Description  8-Bit Programmable Multiply/Divide Unit
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CDP1855 Datasheet(HTML) 10 Page - Intersil Corporation

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The result of 201F7C16 x 723C0916 is 0E558DBA2B5C =
1576061279727610. It will be stored in memory as follows:
0010
653C;
0017
OUT 5;
DC 030H
. . LOAD NEXT MSB OF Z REG
0012
;
0018
. . WITH 3C
0012
6509;
0019
OUT 5;
DC 09H
. . LOAD LSB OF Z REGISTER
0014
;
0020
. . WITH 09
0014
6759;
0021
OUT 7;
DC 059H
. . LOAD CONTROL REGISTERS
0016
;
0022
. . RESETTING Y REGISTERS
0016
;
0023
. . AND SEQUENCE COUNTERS
0016
;
0024
. . AND STARTING MULTIPLY
0016
;
0025
. . OPERATION
DELAY FOR MULTIPLY TO FINISH
0016
E2;
0026
SEX R2
0017
6E60;
0027
INP 6;
IRX
. . MSB OF RESULTS IS STORED
0019
;
0028
. . AT LOCATION 0030
0019
6E60;
0029
INP 6;
IRX
001B
6E60;
0030
INP 6;
IRX
001D
6D60;
0031
INP 5;
IRX
001F
6D60;
0032
INP 5;
IRX
0021
6D;
0033
INP 5
. . COMPLETE LOADING RESULT
0022
;
0034
. . INTO MEMORY LOCATIONS
0022
;
0035
. . 0030 TO 0035
0022
;
0036
. . RESULTS = 0E558DBA2B5C
0022
3022;
0037 STOP
BR STOP
0024
;
0038
END
0000
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: (Continued)
MEMORY
LOCATION
OP
CODE
LINE
NO.
ASSEMBLY LANGUAGE
LOC
BYTE
0030
0E
31
55
32
8D
33
BA
34
2B
35
5C
BEFORE MULTIPLY
MDU1
MDU2
MDU3
REGISTER X
20
1F
7C
REGISTER Y
00
00
00
REGISTER Z
72
3C
09
AFTER MULTIPLY
MDU1
MDU2
MDU3
REGISTER X
20
1F
7C
REGISTER Y
0E
55
8D
REGISTER Z
BA
2B
5C
CDP1855, CDP1855C


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