Zilog Z08470 - Manual (Page 194)

Z80 Instruction Set UM008007-0715
182
Z80 CPU
User Manual
IM 0
Operation
Set Interrupt Mode 0
Op Code
IM
Operand
0
Description
The IM 0 instruction sets Interrupt Mode 0. In this mode, the interrupting device can insert
any instruction on the data bus for execution by the CPU. The first byte of a multi-byte
instruction is read during the interrupt acknowledge cycle. Subsequent bytes are read in by
a normal memory read sequence.
Condition Bits Affected
None.
M Cycles T States 4 MHz E.T.
2 8 (4, 4) 2.00
1 1 0 0 1 1 1 1 ED
0 1 0 1 0 1 0 0 46