SN250 datasheet(89/130 Pages) STMICROELECTRONICS

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SN250

Functional description—application modules

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7.4

General purpose timers

The SN250 integrates two general-purpose, 16-bit timers—TMR1 and TMR2. Each of the

two timers contains the following features:

●

Configurable clock source

●

Counter load

●

Two output compare registers

●

Two input capture registers

●

Can be configured to do PWM

●

Up/down counting (for PWM motor drive phase correction)

●

Single shot operation mode (timer stops at zero or threshold)

Figure 9 is a block diagram of the Timer TMR1 module. Timer TMR2 is identical.

Figure 9.

Timer TMR1 block diagram

7.4.1

Clock sources

The clock source for each timer can be chosen from the main 12MHz clock, 32.768kHz

clock, 1kHz RC-Clock, or from an external source (up to 100kHz) through TMR1CLK or

TMR2CLK. After choosing the clock source (see Table 28), the frequency can be further

divided to generate the final timer cycle provided to the timer controller (see Table 29). In

addition, the clock edge (either rising or falling) for this timer clock can be selected (see

Table 30).

SN250 bảng dữ liệu(PDF) 89 Page - STMicroelectronics