Zilog Z08470 - Manual (Page 73)

UM008007-0715 CPU Control Group
Z80 CPU
User Manual
61
Descriptions of the Input and Output Group instructions begin on page 291.
CPU Control Group
Table 19 shows the six general-purpose CPU control instructions. The HALT instruction
suspends CPU operation until a subsequent interrupt is received, while the DI and EI are
used to lock out and enable interrupts. The three interrupt mode commands set the CPU to
any of the three available interrupt response modes; each of these is described in the next
paragraph. The NOP instruction has no function.
Table 18. 8-Bit Arithmetic and Logic
Source
Register Register Indirect
A B C D E H L (HL)
11OUT
Immediate (n)
D3
n
Register
Indirect
(c)
ED
79
ED
41
ED
49
ED
51
ED
59
ED
61
ED
69
11OUT: output
inc HL, dec B ED
A3
Block
Output
Command
11OUT: output
dec B, repeat if B
≠0
ED
B3
11OUT: output
dec HL and B ED
AB
11OUTDR: output, dec
HL and B, repeat if
B
≠0
ED
BB
Port
Destination
Address
Note: