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| Z86E3016PSG Datasheet, PDF (327/348 Pages) Zilog, Inc. – Z86E3016PSG | |||
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Z8 CPU
User Manual
309
Stop
STOP
Instruction Format
OPC
Cycles
6
OPC
(Hex)
6F
Operation
This instruction turns off the internal system clock (SCLK) and external
crystal (XTAL) oscillation, and reduces the standby current. STOP mode
is terminated by a RESET which causes the processor to restart the appli-
cation program at address 000Ch.
Flag
C
Z
S
V
D
H
Description
Unaffected
Unaffected
Unaffected
Unaffected
Unaffected
Unaffected
Note: In order to enter STOP mode, it is necessary to ï¬rst ï¬ush the instruction
pipeline to avoid suspending execution in mid-instruction. The user must
execute a NOP immediately before the execution of the STOP instruction.
Example
The statements:
NOP
STOP
Op Codes: FF 6F
place the Z8® CPU into STOP mode.
UM001602-0904
Instruction Description
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