SD60C31/P AUK [AUK corp], SD60C31/P Datasheet - Page 6

• Manufacturer Part Number: SD60C31/P
• Description: CMOS SINGLE-COMPONENT 8-BIT MICROCOMPUTER
• Manufacturer: AUK [AUK corp]

Pin Description(continued)
• Crystal oscillator
Idle Mode
In the Idle mode, the CPU puts itself to sleep while all the on chip peripherals stay active.
The instruction that invokes the Idle mode is the last instruction executed in the normal
operating mode before Idle mode is activated.
The content of the on-chip RAM and all the special function registers remain intact during
this mode. The Idle mode can be terminated either by any enabled interrupt, at which
time the process is picked up at the interrupt service routine and continued, or by a
hardware reset which starts the processor the same as a power on reset.
Power Down Mode
In the power down mode the oscillator is stopped, and the instruction that invokes power
down is the last instruction executed. The on-chip RAM and special function register retain
their values until the power down mode is terminated.
The only exit from power down is a hardware reset. Reset redefines the SFRs but does not
change the on-chip RAM. The reset should not be activated before V
normal operating level and must be held active long enough to allow the oscillator to
restart and stabilize.
The control bits for the reduced power modes are in the special function register PCON.
Table Status of the external pins during Idle and power down modes.
Power down
Power down
Mode
Idle
Idle
Program
memory
External
External
Internal
Internal
30pF
ALE
1
1
0
0
30pF
KSI-W001-000
PSEN
1
0
0
1
PORT 0
Float
Float
Data
Data
SD60C31/P SD60C51/P
XTAL2
XTAL1
V
SS
PORT 1
Data
Data
Data
Data
CC
PORT 2
Address
Data
Data
Data
is restored to its
PORT 3
Data
Data
Data
Data
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