C515A Datasheet, PDF (41/58 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C515A
Table 8
Power Saving Modes Overview
Mode
Idle mode
Entering
2-Instruction
Example
ORL PCON, #01H
ORL PCON, #20H
Slow Down Mode In normal mode:
ORL PCON,#10H
With idle mode:
ORL PCON,#01H
ORL PCON, #30H
Software
ORL PCON, #02H
Power Down Mode ORL PCON, #40H
Hardware
HWPD = 0
Power Down Mode
Leaving by
Occurrence of an
interrupt from a
peripheral unit
Hardware Reset
ANL PCON,#0EFH
or
Hardware Reset
Occurrence of an
interrupt from a
peripheral unit
Hardware reset
Hardware Reset
Short low pulse at
pin P3.2/INT0
HWPD = 1
Remarks
CPU clock is stopped;
CPU maintains their data;
peripheral units are active (if
enabled) and provided with
clock
Internal clock rate is reduced
to 1/8 of its nominal frequency
CPU clock is stopped;
CPU maintains their data;
peripheral units are active (if
enabled) and provided with 1/8
of its nominal frequency
Oscillator is stopped;
contents of on-chip RAM and
SFR’s are maintained;
Oscillator is stopped; internal
reset is executed;
Semiconductor Group
41
1997-10-01