Zilog Z80380 Manual do Utilizador descarregar pdf (Página 172)

100

101

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

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 267 268

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