Sraw shift right arithmetic (word) – Zilog Z80380 User Manual
Page 203
5-169
Z380
™
U
SER
'
S
M
ANUAL
Z
ILOG
DC-8297-03
SRAW
SHIFT RIGHT ARITHMETIC (WORD)
SRAW dst
dst = R, RX, IR, X
Operation:
tmp
←
dst
C
←
dst(0)
dst(15)
←
tmp(15)
dst(n)
←
tmp(n+1) for n = 0 to 14
The contents of the destination operand are shifted right one bit position. Bit 0 of the
destination operand is moved to the Carry flag and the most significant bit remains
unchanged.
Flags:
S:
Set if the result is negative; cleared otherwise
Z:
Set if the result is zero; cleared otherwise
H:
Cleared
P:
Set if parity of the result is even; cleared otherwise
N:
Cleared
C:
Set if the bit shifted from bit 0 was a 1; cleared otherwise
Addressing
Execute
Mode
Syntax
Instruction Format
Time
Note
R:
SRAW R
11101101 11001011 001010rr
2
RX:
SRAW RX
11101101 11001011 0010110y
2
IR:
SRAW (HL)
11101101 11001011 00101010
2+r
X:
SRAW (XY+d)
11y11101 11001011 ——d— 00101010
4+r
I
Field Encodings:
rr: 00 for BC, 01 for DE, 11 for HL
y:
0 for IX, 1 for IY