CP3SP33SMSSLASHNOPB datasheet(326/407 Pages) TI1

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Timer/Counter 1

TCNT1_n

Timer 1

Clock

Reload A

TCRA_n

TAPND

TAIEN

Timer

Interrupt 1

TAEN

TAn

TBn

Underflow

Timer/Counter 2

TCNT2_n

Timer 2

Clock

Reload B

TCRB_n

TDPND

TDIEN

Timer

Interrupt 2

Underflow

Clock

Selector

DS453

CP3SP33

SNOSCW5 – MAY 2013

www.ti.com

32.2.3 Mode 3: Dual Independent Timer/Counter

Mode 3 is the Dual Independent Timer mode, which generates system timing signals or counts

occurrences of exter- nal events.

Figure 32-6 is a block diagram of the Multi-Function Timer configured to operate in Mode 3. The timer is

configured to operate as a dual independent system timer or dual external event counter. In addition,

Timer/Counter 1 can generate a 50% duty cycle PWM signal on the TAn pin. The TBn pin can be used as

an external event input or pulse-accumulate input and can be used as the clock source for either Timer/

Counter 1 or Timer/Counter 2. Both counters can also be clocked by the prescaled PCLK Clock.

Timer/Counter 1 (TCNT1_n) counts down at the rate of the selected clock. On underflow, it is reloaded

from the TCRA_n register and counting proceeds down from the reloaded value. In addition, the TAn pin

is toggled on each underflow if this function is enabled by the TAEN bit. The initial state of the TAn pin is

software-programmable. When the TAn pin is toggled from low to high, it sets the TCPND interrupt

pending bit and also asserts an interrupt if enabled by the TAIEN bit.

Because the TAn pin toggles on every underflow, a 50% duty cycle PWM signal can be generated on the

TAn pin without any further action from the CPU.

Timer/Counter 2 (TCNT2_n) counts down at the rate of the selected clock. On underflow, it is reloaded

from the TCRB_n register and counting proceeds down from the reloaded value. In addition, each

underflow sets the TDPND interrupt pending bit and asserts an interrupt if the interrupt is enabled by the

TDIEN bit.

Figure 32-6. Dual-Independent Timer/Counter Mode

326

Dual Multi-Function Timers

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