Z80180 Datasheet, PDF (52/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z 8018x Fam ily
M PU Us e r M anual
37
Table 5. Power-Down Modes (Z8S180/Z8L180-Class Processors Only)
Power-
Down
Modes
On-Chip
CPU Core I/O
Osc.
Recovery
CLKOUT Source
Recovery Time
(Minimum)
SLEEP
Stop
Running Running Running RESET,
Interrupts
1.5 Clock
I/O STOP Running Stop
Running Running By
–
Programming
SYSTEM Stop
Stop
Running Running RESET,
1.5 Clock
STOP
Interrupts
IDLE †
Stop
Stop
Running Stop
RESET,
8 + 1.5 Clock
Interrupts,
BUSREQ
STANDBY † Stop
Stop
Stop Stop
RESET,
2¹⁷ + 1.5 Clock
Interrupts, (Normal
BUSREQ
Recovery)
2⁶ + 1.5 Clock
(Quick Recovery)
† 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:
• STANDBY mode
• IDLE mode
The STANDBY/IDLE mode is selected by multiplexing bits 1 and 3 of
the CPU Control Register (CCR, I/O Address = 1FH).
To enter STANDBY mode:
UM005001-ZMP0400