RM0352 datasheet(53/138 Pages) STMICROELECTRONICS

Il numero della parte	RM0352

Spiegazioni elettronici	Brain smart hub family

PDF	138 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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RM0352

ARM© dual timer module (SP804)

137

Figure 9 shows how the timer clock enable is generated by the prescaler.

Figure 9. Prescale clock enable generation

Figure 10 shows an example of how the prescaler generates the timer clock enable for

a prescaler setting of divide by 16.

Figure 10. Example timing diagram of prescaler clock enable generation

Timer operation

After the initial application and release of PRESETn, the Timer state is initialized as follows:

•

The counter is disabled, TimerEn = 0

•

Free running mode is selected, TimerMode = 0 and OneShot = 0

•

16-bit counter mode is selected, TimerSize = 0

•

Prescalers are set to divide by 1, TimerPre = 0x0

•

Interrupts are cleared but enabled, IntEnable = 1

•

The load register is set to zero

•

The counter value is set to 0xFFFFFFFF.

The operation in each of the three Timer modes is described in:

•

Free running mode

•

Periodic mode

•

One-shot mode

RM0352 Scheda tecnica(PDF) 53 Page - STMicroelectronics