C509-L_97 Datasheet, PDF (118/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Bit
CTP
CLK2
CLK1
CLK0
CT1P
CLK12
CLK11
CLK10
CT1F
On-Chip Peripheral Components
C509-L
Function
Compare timer input clock selection.
Based on f_OSC 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
CTP = 0
0
0
0
f_OSC
0
0
1
f_OSC ÷ 2
0
1
0
f_OSC ÷ 4
0
1
1
f_OSC ÷ 8
1
0
0
f_OSC ÷ 16
1
0
1
f_OSC ÷ 32
1
1
0
f_OSC ÷ 64
1
1
1
f_OSC ÷ 128
Compare Timer
Input Clock
CTP = 1
(default after reset)
f_OSC ÷ 2
f_OSC ÷ 4
f_OSC ÷ 8
f_OSC ÷ 16
f_OSC ÷ 32
f_OSC ÷ 64
f_OSC ÷ 128
f_OSC ÷ 256
Compare timer 1 input clock selection.
Based on f_OSC these bits define the prescaler divider ratio of the compare
timer 1 input clock according to the following table
Compare Timer 1 Compare Timer 1
CLK12 CLK11 CLK10 Input Clock
Input Clock
CT1P = 0
CT1P = 1
0
0
0
f_OSC
0
0
1
f_OSC ÷ 2
0
1
0
f_OSC ÷ 4
0
1
1
f_OSC ÷ 8
1
0
0
f_OSC ÷ 16
1
0
1
f_OSC ÷ 32
1
1
0
f_OSC ÷ 64
1
1
1
f_OSC ÷ 128
f_OSC ÷ 2
f_OSC ÷ 4
f_OSC ÷ 8
f_OSC ÷ 16
f_OSC ÷ 32
f_OSC ÷ 64
f_OSC ÷ 128
f_OSC ÷ 256
Compare timer 1 overflow flag
CT1F is set when the compare timer 1 count rolls over from all ones to
the reload value. When CT1F is set, a compare timer 1 interrupt can be
generated (if enabled). CT1F is cleared by hardware when the compare
timer 1 value is no more equal its reload value.
Semiconductor Group
6-40
1997-10-01