May 2024
Intermediate to advanced
503 pages
17h 2m
English
Content preview from 8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
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114
LOGICAL OPERATIONS
9.5 | CLR Instruction
is 1-byte, one-cycle instruction clears the accumulator. No fl ags are aff ected. is instruction is equivalent
to MOV A, #00H instruction, which is a 2-byte instruction. erefore, using CLR A, the programmer may
save 1 byte of coding. In general, this instruction is useful during any initialization process. Fig. 9.5 illustrates
the execution of this instruction.
Instruction: CPL 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 F0H
E0H
01FD
01FC
01FB
01FA
01F9
01F8
01F7
01F6
01F5
D0H
AC F0 RS1
0
RS0
0
OV - P
Flags Affected: none
0100 1101
1011 0010
Opcode: F4H
Reg.
Bank
#0
Ban ...
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