ZiLOG Z8 Technical Manual

RL
Rotate Left
Rl dst
Instruction format:
Cycles
OPC
(Hex)
Address Mode
det
~ ______ O_PC ______ ~11 ~ _______ ds_t ______ ~
6
6
90
91
R
IR
Operation:
flags:
Example:
Note:
5-38
C <-- dst(7)
dst(O) <-- dst(7)
dst(n + 1) <-- dst(n) n = 0 - 6
The contents of the destination operand are rotated left one bit position. The
initial value of bit 7 is rooved to the bit 0 position and also replaces the carry
flag.
C: Set if the bit rotated from the roost significant bit position was 1; i.e., bit 7
was 1
Z:
Set if the result is zero; cleared otherwise.
V: Set if arithmetic overflow occurred; that is, if the sign of the destination
changed during rotation; cleared otherwise.
5: Set if the result bit 7 is set; cleared otherwise
H: Unaffected
0: Unaffected
If the contents of the register named SHIFTER are %88 (10001000), the statement
RL SHIFTER
leaves the value %11 (00010001) in that register. The C flag and V flags are set to
1 and the Z flag is cleared.
When used to specify a 4-bit working-register address, address roodes R or IR use the
format:
E
dst

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English