RM0352 datasheet(52/138 Pages) STMICROELECTRONICS

номер детали	RM0352

подробное описание детали	Brain smart hub family

PDF	138 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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52 / 138 page

ARM© dual timer module (SP804)

RM0352

52/138

DocID024647 Rev 1

TIMCLK equals PCLK and TIMCLKENX equals one

Figure 7 shows the case where TIMCLK is identical to PCLK and TIMCLKENX is

permanently enabled. In this case, the counter is decremented on every TIMCLK edge.

Figure 7. TIMCLK equals PCLK and TIMCLKENX equals one, clock example

TIMCLK is less than PCLK and TIMCLKENX equals one

Figure 8 shows the case where TIMCLK frequency is a submultiple of the PCLK frequency

but the rising edges of TIMCLK are synchronous and balanced with PCLK edges.

TIMCLKENX is permanently enabled. In this case, the counter is decremented on every

TIMCLK rising edge.

Figure 8. TIMCLK is less than PCLK and TIMCLKENX equals one, clock example

Prescaler operation

The prescaler generates a timer clock enable that is used to enable the decrementing of the

timer counter at one of the following rates:

•

The effective timer clock rate where TIMCLK is qualified by TIMCLKENX

•

The effective timer clock rate divided by 16

•

The effective timer clock rate divided by 256.

RM0352 датащи(PDF) 52 Page - STMicroelectronics