z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 264
z80189
Manufacturer Part Number
z80189
Description
Z80180, Z8s180, Z8l180 Mpu Operation
Manufacturer
ZiLOG Semiconductor
Datasheet
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UM005003-0703
Z8018x
Family MPU User Manual
Note 1: (HL) replaces g.
Note 2: (HL) replaces s.
Note 3: If DDH is supplemented as first Op Code for the instructions
which have HL or (HL) as an operand in Table 48, the instructions are
executed replacing HL with IX and (HL) with (IX+d).
ex. 22H : LD (mn), HL
DDH 22H : LD (mn), IX
If FDH is supplemented as 1st Op Code for the instructions which have
HL or (HL) as an operand in Table 48, the instructions are executed
replacing HL with IY and (HL) with (IY+d).
ex. 34H : INC (HL)
FDH 34H : INC (IY+d)
However, JP (HL) and EX DE, HL are exceptions and note the following.
•
•
•
If DDH is supplemented as 1st Op Code for JP (HL), (IX) replaces
(HL) as operand and JP (IX) is executed
If FDH is supplemented as 1st Op Code for JP (HL), (IY) replaces
(HL) as operand and JP (IY) is executed
Even if DDH or FDH is supplemented as 1st Op Code for EX DE,
HL, HL is not replaced and the instruction is regarded as illegal
instruction.
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