
5-138
Z380
™
USER'S MANUAL
DC-8297-03
ZILOG
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
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