Zilog Z08470 - Manual (Page 191)

UM008007-0715 Z80 Instruction Description
Z80 CPU
User Manual
179
HALT
Operation
—
Op Code
HALT
Operands
None.
Description
The HALT instruction suspends CPU operation until a subsequent interrupt or reset is
received. While in the HALT state, the processor executes NOPs to maintain memory
refresh logic.
Condition Bits Affected
None.
M Cycles T States 4 MHz E.T.
1 4 1.00
0 1 1 1 0 1 1 0 76