C509-L_97 Datasheet, PDF (228/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Power Saving Modes
C509-L
9.2 Power Saving Mode Control Register PCON
The SFR PCON is used for control of the power saving modes. It also contains two general purpose
flags, which can be used e.g. by software for power saving mode management.
Special Function Register PCON (Address 87H)
Reset Value : 00H
Bit No. MSB
LSB
7
6
5
4
3
2
1
0
87H SMOD PDS IDLS SD GF1 GF0 PDE IDLE PCON
Bit
PDS
IDLS
SD
GF1
GF0
PDE
IDLE
The shaded bits are not used for power saving mode control.
Function
Power down start bit
The instruction that sets the PDS flag bit is the last instruction before entering the
power down mode.
IDLE start bit
The instruction that sets the IDSL flag bit is the last instruction before entering the
idle mode.
Slow down bit
When set, the slow-down mode is enabled.
General purpose flag
General purpose flag
Power down enable bit
When set, starting the power down mode is enabled.
Idle mode enable bit
When set, starting the idle mode is enabled.
Semiconductor Group
9-3
1997-10-01