Z8S180 Zilog., Z8S180 Datasheet - Page 56
Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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STANDBY-QUICK RECOVERY Mode
Internal I/O Registers
Note:
except that the 2
asserted eight clock cycles after the exit conditions are gathered.
STANDBY-QUICK RECOVERY mode is an option offered in
STANDBY mode to reduce the clock recovery time in STANDBY mode
from 2
MHz). This feature can only be used when providing an oscillator as
clock source.
To enter STANDBY-QUICK RECOVERY mode:
1. Set bits 6 and 3 to
2. Set the I/O STOP bit (bit 5 of ICR, I/O Address =
3. Execute the SLEEP instruction
When the part is in STANDBY-QUICK RECOVERY mode, the
operation is identical to STANDBY mode except when exit conditions
are gathered, using RESET, BUS REQUEST or EXTERNAL
INTERRUPTS. The clock and other control signals are recovered sooner
than the STANDBY mode.
The Z8X180 internal I/O Registers occupy 64 I/O addresses (including
reserved addresses). These registers access the internal I/O modules
(ASCI, CSI/O, PRT) and control functions (DMAC, DRAM refresh,
interrupts, wait state generator, MMU and I/O relocation).
17
If STANDBY-QUICK RECOVERY is enabled, the user must
ensure stable oscillation is obtained within 64 clock cycles
clock cycles (4 s at 33 MHz) to 2
17
bit wake-up timer is bypassed. All control signals are
1
and
1
, respectively.
6
clock cycles (1.9 s at 33
M PU Us e r M anual
UM005001-ZMP0400
Z 8018x Fam il y
3FH
) to
1
.
41
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