C165H Datasheet, PDF (214/499 Pages) Infineon Technologies AG – EMBEDDED C166 WITH USART IOM-2 AND HDLC SUPPORT

C165H
General Purpose Timer Unit
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.
Interrupt
Request
T3l
f_{hw_clk}
2ⁿ : 1
Y _*)
R Edge
Select
T3R
Core Timer T3
Up/Down
T3OTL
T3OE
T3OUT
A _{Auxiliary Timer Tx}
TxIR
Interrupt
Request
IN ^{- TxR}
T ^Txl
x = 2,4
MCB02034gpt1
IM P Note: Line ’*’ only affected by over/underflows of T3, but NOT by software
modifications of T3OTL.
L ^R Figure 67 Concatenation of Core Timer T3 and an Auxiliary Timer
E ^{E Auxiliary Timer in Reload Mode}
R ^{C Reload mode for the auxiliary timers T2 and T4 is selected by setting bit field TxM in the}
respective register TxCON to ‘100_B’. In reload mode the core timer T3 is reloaded with
X ^{the contents of an auxiliary timer register, triggered by one of two different signals. The}
trigger signal is selected the same way as the clock source for counter mode (see table
P _{E above), i.e. a transition of the auxiliary timer’s input or the output toggle latch T3OTL may}
- ^{trigger the reload.}
Note: When programmed for reload mode, the respective auxiliary timer (T2 or T4) stops
independent of its run flag T2R or T4R.
Data Sheet
214
2001-04-19