C167CS datasheet(253/517 Pages) INFINEON

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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-25

V2.0, 2000-07

Timer 6 Run Bit

The timer can be started or stopped by software through bit T6R (Timer T6 Run Bit). If

T6R = ‘0’, the timer stops. Setting T6R to ‘1’ will start the timer.

In gated timer mode, the timer will only run if T6R = ‘1’ and the gate is active (high or low,

as programmed).

Count Direction Control

The count direction of the core timer can be controlled either by software or by the

external input pin T6EUD (Timer T6 External Up/Down Control Input), which is the

alternate input function of port pin P5.10. These options are selected by bits T6UD and

T6UDE in control register T6CON. When the up/down control is done by software (bit

T6UDE = ‘0’), the count direction can be altered by setting or clearing bit T6UD. When

T6UDE = ‘1’, pin T6EUD is selected to be the controlling source of the count direction.

However, bit T6UD can still be used to reverse the actual count direction, as shown in

Table 10-9. If T6UD = ‘0’ and pin T6EUD shows a low level, the timer is counting up.

With a high level at T6EUD the timer is counting down. If T6UD = ‘1’, a high level at pin

T6EUD specifies counting up, and a low level specifies counting down. The count

direction can be changed regardless of whether the timer is running or not.

Note: The direction control works the same for core timer T6 and for auxiliary timer T5.

Therefore the pins and bits are named Tx …

Table 10-9

GPT2 Core Timer T6 Count Direction Control

Pin TxEUD

Bit TxUDE

Bit TxUD

Count Direction

Count Up

Count Down

Count Up

Count Down

Count Up

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