XC164-16 Datasheet, PDF (176/417 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller with C166SV2 Core Volume 2 (of 2): Peripheral Units

XC164-16 Derivatives
Peripheral Units (Vol. 2 of 2)
Capture/Compare Unit 6 (CAPCOM6)
18.2.1 T13 Operation
The input clock f_T13 of Timer T13 is derived from the module clock f_CC6 through a
programmable prescaler and an optional 1/256 divider. The resulting prescale factors
are listed in Table 18-5. The prescaler of T13 is reset while T13 is not running to ensure
reproducible timings and delays.
Table 18-5
T13CLK
000_B
001_B
010_B
011_B
100_B
101_B
110_B
111_B
Timer T13 Input Clock Options
Resulting Input Clock
Prescaler Off (T13PRE = 0)
f_CC6/1
f_CC6/2
f_CC6/4
f_CC6/8
f_CC6/16
f_CC6/32
f_CC6/64
f_CC6/128
Resulting Input Clock
Prescaler On (T13PRE = 1)
f_CC6/256
f_CC6/512
f_CC6/1024
f_CC6/2048
f_CC6/4096
f_CC6/8192
f_CC6/16384
f_CC6/32768
The period of the timer is determined by the value in the period Register T13PR
according to the following formula:
T13_PER = <Period-Value> + 1; in T13 clocks (f_T13)
(18.3)
While Timer T13 is running, write accesses to the count register T13 are not taken into
account. If T13 is stopped, write actions to register T13 are immediately taken into
account.
As described above, T13 can only count up, comparable to the Edge-Aligned mode of
T12. This leads to very simple ‘counting rules’ for the T13 counter:
• The counter is reset to zero with the next T13 clock edge if a Period-Match is
detected. The counting direction is always upwards.
The behavior of T13 is illustrated in Figure 18-24.
User’s Manual
CAPCOM6_X, V2.0
18-32
V2.1, 2004-03