z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 199

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

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UM005003-0703
Z8018x
Family MPU User Manual
IO (I/O)
IO addressing mode is used only by I/O instructions. This mode specifies
I/O address (IORQ is
1. An operand is output to A0–A7. The contents of accumulator is
2. The contents of Register B is output to A0–A7. The contents of
3. An operand is output to A0–A7.
4. The contents of Register C is output to A0–A7.
output to A8–A15.
Register C is output to A8–A15.
internal I/O register access)
A15 (useful for internal I/O register access).
0
) and outputs them as follows.
00H
is output to A8–A15 (useful for
00H
is output to A8–