C164CM_2 Datasheet, PDF (209/470 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

C164CM/C164SM
Derivatives
General Purpose Timer Unit
Table 10-8
T2I/T4I
X00
001
010
011
101
110
111
GPT1 Auxiliary Timer (Counter Mode) Input Edge Selection
Triggering Edge for Counter Increment/Decrement
None. Counter Tx is disabled
Positive transition (rising edge) on TxIN
Negative transition (falling edge) on TxIN
Any transition (rising or falling edge) on TxIN
Positive transition (rising edge) of output toggle latch T3OTL
Negative transition (falling edge) of output toggle latch T3OTL
Any transition (rising or falling edge) of output toggle latch T3OTL
Note: Only state transitions of T3OTL caused by the overflows/underflows of T3 will
trigger the counter function of T2/T4. Modifications of T3OTL via software will NOT
trigger the counter function of T2/T4.
For counter operation, pin TxIN must be configured as an input; the respective direction
control bit must be ‘0’. The maximum input frequency allowed in counter mode is f_CPU/
16. To ensure that a transition of the count input signal which is applied to TxIN is
recognized correctly, its level should be held for at least 8 f_CPU cycles before it changes.
User’s Manual
10-15
V1.0, 2002-02