Z8
®
CPU
User Manual
UM001604-0108 Instruction Description
231
Shift Right Arithmetic
Syntax
SRA dst
Instruction Format
Operation
C ← dst(0)
dst(0) ← dst(1)
dst(1) ← dst(2)
dst(2) ← dst(3)
dst(3) ← dst(4)
dst(4) ← dst(5)
dst(5) ← dst(6)
dst(6) ← dst(7)
dst(7) ← dst(7)
An arithmetic shift right by one bit position is performed on the destination operand. Bit 0
replaces the C Flag. Bit 7 (the Sign bit) is unchanged and its value is shifted into bit 6, as
shown below.
Address modes R or IR can be used to specify a 4-bit Working Register. In this format, des-
tination Working Register operand is specified by adding
1110b (Eh) to the high nibble of
Cycles
OPC
(Hex)
Address Mode
dst
OPC dst
6D0 R
6D1 IR
Flag Description
C Set if the bit rotated from the least significant bit position was 1 (that is, bit 0 was 1).
Z Set if the result is zero; cleared otherwise.
S Set if the result bit 7 is set; cleared otherwise.
V Always reset to 0.
D Unaffected
H Unaffected
CD7 D6 D5 D4 D3 D2 D1 D0
Note:
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