SDA6000 Datasheet, PDF (164/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Peripherals
Timers T2 and T4 in Timer Mode or Gated Timer Mode
When the auxiliary timers T2 and T4 are programmed to timer mode or gated timer
mode, their operation is the same as described for the core timer T3. The descriptions,
figures and tables apply accordingly with two exceptions:
• There is no TxOUT output line for T2 and T4.
• Overflow/Underflow Monitoring is not supported (no output toggle latch).
Timers T2 and T4 in Counter Mode
In counter mode timers T2 and T4 can be clocked either by a transition at the respective
external input line TxIN, or by a transition of timer T3’s output toggle latch T3OTL.
Edge
Select
TxIN
TxI
TxUD
TxEUD
XOR
TxR
0
MUX
1
TxUDE
Auxiliary Timer Tx
Up/
Down
Interrupt
Request
x = 2, 4
UEB11200
Figure 7-9 Block Diagram of an Auxiliary Timer in Counter Mode
The event causing an increment or decrement of a timer can be a positive, a negative,
or both a positive and negative transition at either the respective input line, or at the
output toggle latch T3OTL.
Bit field TxI in the respective control register TxCON selects the triggering transition (see
Table 7-6).
Users Manual
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2000-06-15