SN250 datasheet(95/130 Pages) STMICROELECTRONICS

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SN250

Functional description—application modules

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7.4.3

Timer functionality (output compare)

There are two output signals from each timer to generate application-specific waveforms.

These waveforms are generated or altered by comparison results with the timer count

value.

There are four comparison results:

●

Counter value reaches zero.

●

Counter value reaches threshold value of TMR1_TOP or TMR2_TOP register.

●

Counter value reaches comparison value of TMR1_CMPA or TMR2_CMPA register.

●

Counter value reaches comparison value of TMR1_CMPB or TMR2_CMPB register.

The output waveform generation from each timer is controlled with the register bits

(TMR_CMPMOD or inverted with TMR_CMPINV) in the TMR1_CMPCFGA, TMR1_CMPCFGB,

TMR2_CMPCFGA

, and TMR2_CMPCFGB registers. Table 31 summarizes the output waveform

generation modes.

The output signals TMR1OA and TMR1OB from Timer 1, and TMR2OA and TMR2OB from

Timer 2, are available on GPIO. For selecting alternate pin functions, refer to Table 17 and

Table 18.

Figure 14 and Figure 15 show examples of all timer output generation modes.

Table 31.

Output waveform settings

TMR_CMPMOD[3:0]

Output waveform generation mode

Disable alteration

Toggle on count = TOP

Set on count = TOP, clear on count = CMPA

Set on count = TOP, clear on count = CMPB

Set to 1

Set on count = CMPA, clear on count = TOP

Toggle on count = CMPA

Set on count = CMPA, clear on count = CMPB

Clear to 0

Set on count = CMPB, clear on count = TOP

Set on count = CMPB, clear on count = CMPA

Toggle on count = CMPB

Toggle on count = ZERO

Set on count = ZERO, clear on count = TOP

Set on count = ZERO, clear on count = CMPA

Set on count = ZERO, clear on count = CMPB

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