C868_02 Datasheet, PDF (118/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller

C868
On-Chip Peripheral Components
Register TCTR0 controls the basic functionality of both timers T12 and T13.
TCTR0L
Timer Control Register 0,Low Byte
[Reset value: 00_H]
7
6
5
4
3
2
1
0
CTM
rw
CDIR
rh
STE12
rh
T12R
rh
T12PRE
rw
T12CLK
rw
Field
T12CLK
T12PRE
T12R¹⁾
Bits
[2:0]
3
4
Type Description
rw Timer T12 Input Clock Select
Selects the input clock for timer T12 which is derived
from the peripheral clock according to the equation
f_T12 = f_per / 2^<T12CLK>.
000 f_T12 = f_per
001 f_T12 = f_per / 2
010 f_T12 = f_per / 4
011 f_T12 = f_per / 8
100 f_T12 = f_per / 16
101 f_T12 = f_per / 32
110 f_T12 = f_per / 64
111 f_T12 = f_per / 128
rw Timer T12 Prescaler Bit
In order to support higher clock frequencies, an
additional prescaler factor of 1/256 can be enabled for
the prescaler for T12.
0 The additional prescaler for T12 is disabled.
1 The additional prescaler for T12 is enabled.
rh Timer T12 Run Bit
T12R starts and stops timer T12. It is set/reset by SW
by setting bits T12RR orT12RS or it is reset by HW
according to the function defined by bitfield T12SSC.
0 Timer T12 is stopped.
1 Timer T12 is running.
User’s Manual
4-74
V 0.4, 2002-01