Download User`s Manual 08.97 8-Bit CMOS Microcontroller http://www.siemens

On-Chip Peripheral Components
C517A
Bit
Function
CLK2
CLK1
CLK0
Compare timer input clock selection.
These bits define the prescaler divider ratio of the compare timer input
clock according to the following table
CLK2
CLK1
CLK0
Compare Timer Input Clock
0
0
0
fOSC ÷ 2
0
0
1
fOSC ÷ 4
0
1
0
fOSC ÷ 8
0
1
1
fOSC ÷ 16
1
0
0
fOSC ÷ 32
1
0
1
fOSC ÷ 64
1
1
0
fOSC ÷ 128
1
1
1
fOSC ÷ 256
Special Function Register CTRELL
Special Function Register CTRELH
Bit No.
MSB
7
(Address DEH)
(Address DFH)
Reset Value : 00H
Reset Value : 00H
6
5
4
3
2
1
LSB
0
DEH
.7
.6
.5
.4
.3
.2
.1
.0
CTRELL
DFH
.7
.6
.5
.4
.3
.2
.1
.0
CTRELH
Bit
Function
CTRELL.7 - 0
Compare timer reload value low part
The CTRELL register holds the lower 8 bits of the 16-bit reload value for
the compare timer.
CTRELH.7 - 0
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
1997-08-01