ZiLOG Z80380 User Manual page 172

Z
ILOG
RES
RESET BIT
RES b, dst
dst(b) ← 0
Operation:
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.
S: Unaffected
Flags:
Z: Unaffected
H: Unaffected
V: Unaffected
N: Unaffected
C: Unaffected
Addressing
Mode Syntax
R: RES b,R
RES b,(HL)
IR:
X: RES b,(XY+d)
Field Encodings: r: per convention
y: 0 for IX, 1 for IY
5-138
dst = R, IR, X
Instruction Format
11001011 10bbb -r-
11001011 10bbb110
11y11101 11001011 ——d— 10bbb110
Z380
U ' M
SER S ANUAL
Execute
Time Note
2
2+r
4+r I
DC-8297-03
™