C167CS datasheet(244/517 Pages) INFINEON

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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-16

V2.0, 2000-07

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. Depending on which

transition of T3OTL is selected to clock the auxiliary timer, this concatenation forms a

32-bit or a 33-bit timer/counter.

• 32-bit Timer/Counter: If both a positive and a negative transition of T3OTL is 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.

Figure 10-11 Concatenation of Core Timer T3 and an Auxiliary Timer

Core Timer Ty

TyOTL

Interrupt

Request

TyOE

TyOUT

TyR

2n : 1

Tyl

MCB02034

CPU

Up/Down

Auxiliary Timer Tx

TxR

Txl

Edge

Select

TxIR

Interrupt

Request

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

T3OUT = P3.3

x = 2.4, y = 3

n = 3 … 10

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