C517A_99 Datasheet, PDF (100/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C517A
Bit
CLK2
CLK1
CLK0
Function
Compare timer input clock selection.
These bits define the prescaler divider ratio of the compare timer input
clock according to the following table
CLK2
0
0
0
0
1
1
1
1
CLK1
0
0
1
1
0
0
1
1
CLK0
0
1
0
1
0
1
0
1
Compare Timer Input Clock
f_OSC ÷ 2
f_OSC ÷ 4
f_OSC ÷ 8
f_OSC ÷ 16
f_OSC ÷ 32
f_OSC ÷ 64
f_OSC ÷ 128
f_OSC ÷ 256
Special Function Register CTRELL (Address DEH)
Special Function Register CTRELH (Address DFH)
MSB
Bit No. 7
6
5
4
3
2
DEH
.7
.6
.5
.4
.3
.2
Reset Value : 00H
Reset Value : 00H
LSB
1
0
.1
.0 CTRELL
DFH
.7
.6
.5
.4
.3
.2
.1
.0 CTRELH
Bit
CTRELL.7 - 0
CTRELH.7 - 0
Function
Compare timer reload value low part
The CTRELL register holds the lower 8 bits of the 16-bit reload value for
the compare timer.
Compare timer reload value high part
The CTRELH register holds the upper 8 bits of the 16-bit reload value for
the compare timer.
Semiconductor Group
6-34