1989_MELPS_7700_Software_Manual

PLB
Pull Accumulator B from Stack
PLB
Operation
If m=O,
Sf-S+1
BL f- M{S)
Sf-S+1
BH (- M{S)
If m=1,
Sf-S+1
BL f- M{S)
Description
The stack pointer S is incremented, and then restores the lower byte of the
accumulator B with the data at the address indicated by the stack pointer S.
Again, increments the stack pointer S and then restores the upper byte of the
accumulator B with the data at the address indicated by the stack pOinter S.
When the data length selection flag m is set to 0, 2 bytes data are restored.
When the data length selection flag m is set to 1, only 1 byte data is restored (to
the lower byte of the accumulator B).
Status flags
IPL :
N
V
m
x
D
I
Not affected.
Set to 1 when bit 15 {or bit 7 if the data length selection flag m is set to 1 )of
the operation result is 1. Otherwise, cleared to o.
Not affected.
Not affected.
Not affected.
Not affected.
Not affected.
Z Set to 1 when the result of operation is O. Otherwise, cleared to O.
C
Not affected.
Addressing mode
Stack
Syntax Machine code
I
I Bytes I Cycles
I PLB 4216, 6816 I 2 I 7
117