DSPIC33FJ06GS201TESLASHMM datasheet(188/346 Pages) MICROCHIP

188 / 346 page

dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04

DS70318D-page 186

Preliminary

The Timer2/3 module can operate in one of the

following modes:

•Timer mode

• Gated Timer mode

• Synchronous Counter mode

In Timer and Gated Timer modes, the input clock is

derived from the internal instruction cycle clock (FCY).

In Synchronous Counter mode, the input clock is

derived from the external clock input at the TxCK pin.

The timer modes are determined by the following bits:

• TCS (TxCON<1>): Timer Clock Source Control bit

• TGATE (TxCON<6>): Timer Gate Control bit

Timer control bit settings for different operating modes

are given in the Table 12-1.

TABLE 12-1:

TIMER MODE SETTINGS

12.1

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.

12.2

32-Bit Operation

A 32-bit timer module can be formed by combining a

Type B and a Type C 16-bit timer module. For 32-bit

timer operation, the T32 control bit in the Type B Timer

Control (TxCON<3>) register must be set. The Type C

timer holds the most significant word (msw) and the

Type B timer holds the least significant word (lsw)

for 32-bit operation.

When configured for 32-bit operation, only the Type B

Timer Control (TxCON) register bits are required for

setup and control while the Type C Timer Control

For interrupt control, the combined 32-bit timer uses

the interrupt enable, interrupt flag and interrupt priority

control bits of the Type C timer. The interrupt control

and status bits for the Type B timer are ignored

during 32-bit timer operation.

The Timer2 and Timer 3 that can be combined to form a

32-bit timer are listed in Table 12-2.

TABLE 12-2:

32-BIT TIMER

A block diagram representation of the 32-bit timer

module is shown in Figure 12-3. The 32-timer module

can operate in one of the following modes:

• Timer mode

• Gated Timer mode

• Synchronous Counter mode

To configure the features of Timer2/3 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.

Mode

TCS

TGATE

Timer

Gated Timer

Synchronous Counter

Type B Timer (lsw)

Type C Timer (msw)

Timer2

Timer3

DSPIC33FJ06GS201TE/MM Datasheet(PDF) 188 Page - Microchip Technology

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