DSPIC33FJ12MC02ESS datasheet(131/284 Pages) MICROCHIP

131 / 284 page

Preliminary

DS70265B-page 129

dsPIC33FJ12MC201/202

10.0 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 10-1 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 10-1:

16-BIT TIMER1 MODULE BLOCK DIAGRAM

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.

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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