Zilog Z86193 Manual do Utilizador descarregar pdf (Página 179)

CPU

User Manual

UM001604-0108 Instruction Description

172

Decimal Adjust

Syntax

DA dst

Instruction Format

Operation

dst ← DA dst

The destination operand is adjusted to form two 4-bit BCD digits following a binary addi-

tion or subtraction operation on BCD encoded bytes. For addition (ADD and ADC) or

subtraction (SUB and SBC), the following table indicates the operation performed.

If the destination operand is not the result of a valid addition or subtraction of BCD digits,

the operation is undefined.

Cycles

OPC

(Hex)

Address Mode

dst

OPC dst

840 R

841 IR

Instruction

Carry

Before DA

Bits 7–4

Value (Hex)

H Flag

Before DA

Bits 3–0

Value (Hex)

Number Added

To Byte

Carry After

0 0–9 0 0–9 00 0

0 0–8 0 A–F 06 0

0 0–9 1 0–3 06 0

ADD 0 A–F 0 0–9 60 1

ADC 0 9–F 0 A–F 66 1

0 A–F 1 0–3 66 1

1 0–2 0 0–9 60 1

1 0–2 0 A–F 66 1

1 0–3 1 0–3 66 1

0 0–9 0 0–9 00 0

SUB 0 0–8 1 6–F FA 0

SBC 1 7–F 0 0–9 A0 1

1 6–F 1 6–F 9A 1

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 259 260

Comentários a estes Manuais

Sem comentários

Zilog Z86193 Manual do Utilizador Página 179

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Zilog Z86193