Standby Mode; Table 5. Power-Down Modes (Z8S180/Z8L180-Class Processor Only) - ZiLOG Z8018 Series User Manual

Table 5. Power-Down Modes (Z8S180/Z8L180-Class Processors Only)
Power-
Down
Modes CPU Core
SLEEP Stop
I/O STOP Running
SYSTEM Stop
STOP
IDLE † Stop
STANDBY † Stop
† IDLE and STANDBY modes are only offered in the Z8S180. The minimum recovery time can
be achieved if INTERRUPT is used as the Recovery Source.

STANDBY Mode

The Z8S180/Z8L180 is designed to save power. Two low-power
programmable power-down modes have been added:
•
•
The STANDBY/IDLE mode is selected by multiplexing bits 1 and 3 of
the CPU Control Register (CCR, I/O Address =
To enter STANDBY mode:
On-Chip
I/O Osc.
Running Running Running
Stop Running Running
Stop Running Running
Stop Running Stop
Stop Stop
STANDBY mode
IDLE mode
Family MPU User Manual
Recovery
CLKOUT Source
RESET,
Interrupts
By
Programming
RESET,
Interrupts
RESET,
Interrupts,
BUSREQ
Stop RESET,
Interrupts,
BUSREQ
1FH
Z8018x
Recovery Time
(Minimum)
1.5 Clock
–
1.5 Clock
8 + 1.5 Clock
17
2 + 1.5 Clock
(Normal
Recovery)
6
2 + 1.5 Clock
(Quick Recovery)
).
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