DSPIC33FJ12MC02ESS datasheet(133/284 Pages) MICROCHIP

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Preliminary

DS70265B-page 131

dsPIC33FJ12MC201/202

11.0 TIMER2/3 FEATURE

The Timer2/3 feature has three 2-bit timers that can

also be configured as two independent 16-bit timers

with selectable operating modes.

As a 32-bit timer, the Timer2/3 feature permits

operation in three modes:

• Two Independent 16-bit timers (e.g., Timer2 and

Timer3) with all 16-bit operating modes (except

Asynchronous Counter mode)

• Single 32-bit timer (Timer2/3)

• Single 32-bit synchronous counter (Timer2/3)

The Timer2/3 feature also supports:

• Timer gate operation

• Selectable prescaler settings

• Timer operation during Idle and Sleep modes

• Interrupt on a 32-bit period register match

• Time base for Input Capture and Output Compare

modules (Timer2 and Timer3 only)

• ADC1 event trigger (Timer2/3 only)

Individually, all eight of the 16-bit timers can function as

synchronous timers or counters. They also offer the

features listed above, except for the event trigger. The

operating modes and enabled features are determined

by setting the appropriate bit(s) in the T2CON, T3CON

registers. T2CON registers are shown in generic form

in Register 11-1. T3CON registers are shown in

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

significant word, and Timer3 is the most significant

word of the 32-bit timers.

11.1

32-bit Operation

To configure the Timer2/3 feature timers for 32-bit

operation:

Set the T32 control bit.

Select the prescaler ratio for Timer2 using the

TCKPS<1:0> bits.

Set the Clock and Gating modes using the

corresponding TCS and TGATE bits.

Load the timer period value. PR3 contains the

most significant word of the value, while PR2

contains the least significant word.

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 corresponding TON bit.

The timer value at any point is stored in the register

pair, TMR3:TMR2, which always contains the most

significant word of the count, while TMR2 contains the

least significant word.

11.2

16-bit Operation

To configure any of the timers for individual 16-bit

operation:

Clear the T32 bit corresponding to that timer.

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

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.

Note:

This data sheet summarizes the features

of the dsPIC33FJ12MC201/202 devices.

It is not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to the

“dsPIC33F Family Reference Manual”.

Please see the Microchip web site

(www.microchip.com)

for

the

latest

dsPIC33F Family Reference Manual

chapters.

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 used for the 32-bit

timer modules, but an interrupt is

generated with the Timer3 interrupt flags.

DSPIC33FJ12MC02ESS 数据表(PDF) 133 Page - Microchip Technology

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