Zilog Z80380 Uživatelský manuál stáhnout pdf (Strana 194)

5-160

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

SBC

SUBTRACT WITH CARRY (WORD)

SBC HL,src dst = HL

src = BC, DE, HL, SP

Operation: HL(15-0) ← HL(15-0) - src(15-0) - C

The source operand together with the Carry flag is subtracted from the HL register and the

difference is stored in the HL register. The contents of the source are unaffected. Two's

complement subtraction is performed.

Flags: S: Set if the result is negative; cleared otherwise

Z: Set if the result is zero; cleared otherwise

H: Set if there is a borrow from bit 12 of the result; cleared otherwise

V: Set if arithmetic overflow occurs, that is, if the operands are of different signs and the

result is of the same sign as the the source; cleared otherwise

N: Set

C: Set if there is a borrow from the most significant bit of the result; cleared otherwise

Addressing Execute

Mode Syntax Instruction Format Time Note

R: SBC HL,R 11101101 01rr0010 2

Field Encodings: rr: 00 for BC, 01 for DE, 10 for HL, 11 for SP

1 2 ... 189 190 191 192 193 194 195 196 197 198 199 ... 267 268

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Zilog Z80380 Uživatelský manuál Strana 194