ST7MC1K2 datasheet(114/371 Pages) STMICROELECTRONICS

114 / 371 page

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On-chip peripherals

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

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Figure 49.

Output compare timing diagram, fTIMER =fCPU/4

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

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

Equation 3 below).

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 51).

Internal CPU clock

Timer clock

Counter register

Output compare register i (OCRi)

2ED3

2ED0

2ED1

2ED2

2ED3

2ED4

2ECF

OCMPi pin (OLVLi = 1)

Output compare flag i (OCFi)

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