ST72361AR4-Auto datasheet(132/279 Pages) STMICROELECTRONICS

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8-bit timer (TIM8)

ST72361xx-Auto

132/279

Doc ID 12468 Rev 3

Figure 67.

Output compare timing diagram, fTIMER =fCPU/4

13.3.5

One pulse mode

One Pulse mode enables the generation of a pulse when an external event occurs. This

mode is selected via the OPM bit in the CR2 register.

The one pulse mode uses the Input Capture1 function and the Output Compare1 function.

Procedure

To use one pulse mode:

Load the OC1R register with the value corresponding to the length of the pulse (see the

formula in the opposite column).

Select the following in the CR1 register:

–

Using the OLVL1 bit, select the level to be applied to the OCMP1 pin after the

pulse.

–

Using the OLVL2 bit, select the level to be applied to the OCMP1 pin during the

pulse.

–

Select the edge of the active transition on the ICAP1 pin with the IEDG1 bit (the

ICAP1 pin must be configured as floating input).

Select the following in the CR2 register:

–

Set the OC1E bit, the OCMP1 pin is then dedicated to the Output Compare 1

function.

–

Set the OPM bit.

–

Select the timer clock CC[1:0] (see Table 55).

fCPU CLOCK

TIMER CLOCK

COUNTER REGISTER

OUTPUT COMPARE REGISTER i (OCRi)

COMPARE REGISTER i LATCH

OCMPi PIN (OLVLi =1)

OUTPUT COMPARE FLAG i (OCFi)

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