May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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12.8 | DA A Instruction
To perform BCD arithmetic, MCS-51 off ers DA A instruction. Execution of this instruction needs some
prerequisites. To start with, DA A may only be used immediately after executing either ADD or ADDC
instruction of any addressing mode. DA A would be of no use even after a SUBB instruction. Loading any
number in the accumulator and then executing DA A instruction would not change the accumulator contents
to its BCD equivalent (refer to Fig. 12.13).
Figure 12.14 Execution of DA A instruction
Instruction: DA A
Bytes: 1
Cycles: 1
CY
PSW
0202
0203 31
30
2F
0C
0B
0A
09
08
07
06
05
04
03
02
01
00
0201
0200
01FF
01FE
Reg. A
Reg. B
NOTE: See text for ...
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