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LSRB
Operation:
Description:
Shifts all bits of accumulator B one place to the right. Bit 7 is loaded with
zero. The C status bit is loaded from the least significant bit of B.
Condition Codes and Boolean Formulas:
S
–
N:
Z:
V:
C:
Addressing Modes, Machine Code, and Execution Times:
Source Form
LSRB
CPU12
REFERENCE MANUAL
Logical Shift Right B
0
b7
– – – – – –
X
H
I
N
Z
∆
–
–
–
0
0; Cleared.
Set if result is $00; cleared otherwise.
N ⊕ C = [N • C] + [N • C] (for N and C after the shift)
Set if (N is set and C is cleared) or (N is cleared and C is set); cleared oth-
erwise (for values of N and C after the shift).
B0
Set if the LSB of B was set before the shift; cleared otherwise.
Address Mode
INH
INSTRUCTION GLOSSARY
C
b0
V
C
∆
∆
Object Code
54
LSRB
Cycles
Access Detail
1
O
MOTOROLA
6-137
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