C167CS datasheet(245/517 Pages) INFINEON

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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-17

V2.0, 2000-07

Auxiliary Timer in Reload Mode

Reload mode for the auxiliary timers T2 and T4 is selected by setting bit field TxM in the

respective register TxCON to ‘100B’. In reload mode the core timer T3 is reloaded with

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 10-8), 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.

Figure 10-12 GPT1 Auxiliary Timer in Reload Mode

Upon a trigger signal T3 is loaded with the contents of the respective timer register (T2

or T4) and the interrupt request flag (T2IR or T4IR) is set.

Note: When a T3OTL transition is selected for the trigger signal, also the interrupt

request flag T3IR will be set upon a trigger, indicating T3’s overflow or underflow.

Modifications of T3OTL via software will NOT trigger the counter function of T2/T4.

Reload Register Tx

Core Timer T3

Up/Down

Source/Edge

Select

T3OTL

Interrupt

Request

T3OE

T3OUT

TxIN

Input

Clock

TxI

Interrupt

Request

MCB02035

*) Note: Line only affected by over/underflows of T3, but NOT by software modifications of T3OTL.

x = 2.4

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