Res reset bit – Zilog Z80380 User Manual
Page 172
Advertising
5-138
Z380
™
U
SER
'
S
M
ANUAL
DC-8297-03
Z
ILOG
RES
RESET BIT
RES b, dst
dst = R, IR, X
Operation:
dst(b)
←
0
The specified bit b within the destination operand is cleared to 0. The other bits in the
destination are unaffected. The bit to be reset is specified by a 3-bit field in the instruction;
this field contains the binary encoding for the bit number to be cleared. The bit number b
must be between 0 and 7.
Flags:
S:
Unaffected
Z:
Unaffected
H:
Unaffected
V:
Unaffected
N:
Unaffected
C:
Unaffected
Addressing
Execute
Mode
Syntax
Instruction Format
Time
Note
R:
RES b,R
11001011 10bbb -r-
2
IR:
RES b,(HL)
11001011 10bbb110
2+r
X:
RES b,(XY+d)
11y11101 11001011 ——d— 10bbb110
4+r
I
Field Encodings:
r:
per convention
y:
0 for IX, 1 for IY
Advertising