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C161 Datasheet(PDF) 196 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 196 Page - Infineon Technologies AG |
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196 / 400 page  &3, 7KH*HQHUDO 3XUSRVH 7LPHU8QLWV User’s Manual 10-4 1999-08 Timer 3 Run Bit The timer can be started or stopped by software through bit T3R (Timer T3 Run Bit). If T3R=‘0’, the timer stops. Setting T3R to ‘1’ will start the timer. In gated timer mode, the timer will only run if T3R=‘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 T3EUD (Timer T3 External Up/Down Control Input), which is an alternate port input function. These options are selected by bits T3UD and T3UDE in control register T3CON. When the up/down control is done by software (bit T3UDE=‘0’), the count direction can be altered by setting or clearing bit T3UD. When T3UDE=‘1’, pin T3EUD is selected to be the controlling source of the count direction. However, bit T3UD can still be used to reverse the actual count direction, as shown in the table below. If T3UD=‘0’ and pin T3EUD shows a low level, the timer is counting up. With a high level at T3EUD the timer is counting down. If T3UD=‘1’, a high level at pin T3EUD 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. When pin T3EUD is used as external count direction control input, it must be configured as input, i.e. its corresponding direction control bit must be set to ‘0’. Note: The direction control works the same for core timer T3 and for auxiliary timers T2 and T4. Therefore the pins and bits are named Tx... Table 10-1 GPT1 Core Timer T3 Count Direction Control Pin TxEUD Bit TxUDE Bit TxUD Count Direction X 0 0 Count Up X 0 1 Count Down 0 1 0 Count Up 1 1 0 Count Down 0 1 1 Count Down 1 1 1 Count Up |
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