C164CI_02 Datasheet, PDF (222/484 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

C164CI/C164SI
Derivatives
General Purpose Timer Unit
Timer Concatenation
Using the toggle bit T3OTL as a clock source for an auxiliary timer in counter mode
concatenates the core timer T3 with the respective auxiliary timer. This concatenation
forms either a 32-bit or a 33-bit timer/counter, depending on which transition of T3OTL
is selected to clock the auxiliary timer.
• 32-bit Timer/Counter: If both a positive and a negative transition of T3OTL are used
to clock the auxiliary timer, this timer is clocked on every overflow/underflow of the
core timer T3. Thus, the two timers form a 32-bit timer.
• 33-bit Timer/Counter: If either a positive or a negative transition of T3OTL is selected
to clock the auxiliary timer, this timer is clocked on every second overflow/underflow
of the core timer T3. This configuration forms a 33-bit timer (16-bit core timer + T3OTL
+ 16-bit auxiliary timer).
The count directions of the two concatenated timers are not required to be the same.
This offers a wide variety of different configurations.
T3 can operate in timer, gated timer or counter mode in this case.
Tyl
f_CPU
2ⁿ : 1
Core Timer Ty
TyOTL
TyR
*) _Edge
Select
Up/Down
Interrupt
Request
(TyIR)
Auxiliary Timer Tx
TxR
Txl
Interrupt
Request
(TxIR)
*) Note: Line only affected by over/underflows of T3, but NOT by software modifications of T3OTL.
MCB02034b
x = 2.4, y = 3
n = 3 … 10
Figure 10-11 Concatenation of Core Timer T3 and an Auxiliary Timer
User’s Manual
10-16
V3.1, 2002-02