C509-L_97 Datasheet, PDF (100/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C509-L
The 4 lower bits of special function register PRSC control the timer 0/1 input clock prescaler
operation.
Special Function Register PRSC (Address B4H)
Reset Value : 11010101B
MSB
Bit No. 7
6
B4H WDTP S0P
5
T2P1
4
T2P0
3
T1P1
2
T1P0
1
T0P1
LSB
0
T0P0
PRSC
Bit
T1P1
T1P0
T0P1
T0P0
Timer 1 Control Timer 0 Control
The shaded bits are not used for timer/counter 0 and 1.
Function
Prescaler select bits for timer 1
T1P1
T1P0
Divider Ratio
0
0
1:1
0
1
1 : 2 (reset value)
1
0
1:4
1
1
1:8
Prescaler select bits for timer 0
T0P1
0
0
1
1
T0P0
0
1
0
1
Divider Ratio
1:1
1 : 2 (reset value)
1:4
1:8
Semiconductor Group
6-22
1997-10-01