Zilog Z80380 Manual do Utilizador descarregar pdf (Página 163)

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Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

OUTI

OUTPUT AND INCREMENT (BYTE)

OUTI

Operation: B ← B - 1

HL ← HL + 1

This instruction is used for block output of strings of data. During the I/O transaction the 32-

bit BC register is placed on the address bus. Note that the B register contains the loop count

for this instruction so that A15-A8 are not useable as part of a fixed port address. The

decremented B register is used in the address.

First the B register, used as a counter, is decremented by one. The byte of data from the

memory location addressed by the HL register is loaded into the selected peripheral. The

HL register is then incremented by one, thus moving the pointer to the next source for the

output.

Flags: S: Unaffected

Z: Set if the result of decrementing B is zero; cleared otherwise

H: Unaffected

V: Unaffected

N: Set

C: Unaffected

Addressing Execute

Mode Syntax Instruction Format Time Note

OUTI 11101101 10100011 2+r+o

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 267 268

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Zilog Z80380 Manual do Utilizador Página 163