DSPIC33FJMC202ESS datasheet(143/330 Pages) MICROCHIP

143 / 330 page

DS70283K-page 143

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

11.0 TIMER1

The Timer1 module is a 16-bit timer, which can serve

as the time counter for the real-time clock, or operate

as a free-running interval timer/counter. Timer1 can

operate in three modes:

• 16-bit Timer

• 16-bit Synchronous Counter

• 16-bit Asynchronous Counter

Timer1 also supports these features:

• Timer gate operation

• Selectable prescaler settings

• Timer operation during CPU Idle and Sleep

modes

• Interrupt on 16-bit Period register match or falling

edge of external gate signal

Figure 11-1 presents a block diagram of the 16-bit timer

module.

To configure Timer1 for operation:

Set the TON bit (= 1) in the T1CON register.

Select the timer prescaler ratio using the

TCKPS<1:0> bits in the T1CON register.

Set the Clock and Gating modes using the TCS

and TGATE bits in the T1CON register.

Set or clear the TSYNC bit in T1CON to select

synchronous or asynchronous operation.

Load the timer period value into the PR1

If interrupts are required, set the interrupt enable

bit, T1IE. Use the priority bits, T1IP<2:0>, to set

the interrupt priority.

FIGURE 11-1:

16-BIT TIMER1 MODULE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32MC202/204 and

dsPIC33FJ16MC304 family of devices. It

is not intended to be a comprehensive

reference source. To complement the

information in this data sheet, refer to

Section 11. “Timers” (DS70205) of the

dsPIC33F/PIC24H

Family

Reference

Manual, which is available from the Micro-

chip web site (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

TON

SOSCI

SOSCO/

PR1

Set T1IF

Equal

Comparator

TMR1

Reset

SOSCEN

TSYNC

TCKPS<1:0>

Prescaler

1, 8, 64, 256

TGATE

TCY

T1CK

TCS

TGATE

Sync

Gate

Sync

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