PIC24F04KA201 datasheet(105/224 Pages) MICROCHIP

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Preliminary

DS39937B-page 103

PIC24F04KA201 FAMILY

12.0

TIMER2/3

The Timer2/3 module is a 32-bit timer, which can also be

configured as two independent 16-bit timers with

selectable operating modes.

As a 32-bit timer, Timer2/3 operates in three modes:

• Two independent 16-bit timers (Timer2 and

Timer3) with all 16-bit operating modes (except

Asynchronous Counter mode)

• Single 32-bit timer

• Single 32-bit synchronous counter

They also support these features:

• Timer gate operation

• Selectable prescaler settings

• Timer operation during Idle and Sleep modes

• Interrupt on a 32-bit Period register match

• ADC Event Trigger

Individually, both of the 16-bit timers can function as

synchronous timers or counters. They also offer the

features listed above, except for the ADC event trigger

(this is implemented only with Timer3). The operating

modes and enabled features are determined by setting

the appropriate bit(s) in the T2CON and T3CON

registers. T2CON and T3CON are provided in generic

form in Register 12-1 and Register 12-2, respectively.

For 32-bit timer/counter operation, Timer2 is the least

significant word (lsw) and Timer3 is the most significant

word (msw) of the 32-bit timer.

To configure Timer2/3 for 32-bit operation:

Set the T32 bit (T2CON<3> = 1).

Select the prescaler ratio for Timer2 using the

TCKPS<1:0> bits.

Set the Clock and Gating modes using the TCS

and TGATE bits.

Load the timer period value. PR3 will contain the

msw of the value while PR2 contains the lsw.

If interrupts are required, set the interrupt enable

bit, T3IE; use the priority bits, T3IP<2:0>, to set

the interrupt priority.

While Timer2 controls the timer, the interrupt

appears as a Timer3 interrupt.

Set the TON bit (= 1).

The timer value, at any point, is stored in the register

pair, TMR<3:2>. TMR3 always contains the msw of the

count, while TMR2 contains the lsw.

To configure any of the timers for individual 16-bit

operation:

Clear the T32 bit in T2CON<3>.

Select the timer prescaler ratio using the

TCKPS<1:0> bits.

Set the Clock and Gating modes using the TCS

and TGATE bits.

Load the timer period value into the PRx register.

If interrupts are required, set the interrupt enable

bit, TxIE; use the priority bits, TxIP<2:0>, to set

the interrupt priority.

Set the TON bit (TxCON<15> = 1).

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information on Timers,

refer to the “PIC24F Family Reference

Manual”

Section

14.

“Timers”

(DS39704).

Note:

For 32-bit operation, T3CON control bits

are ignored. Only T2CON control bits are

used for setup and control. Timer2 clock

and gate inputs are utilized for the 32-bit

timer modules, but an interrupt is generated

with the Timer3 interrupt flags.

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