PIC24FJ128GA310 datasheet(197/406 Pages) MICROCHIP

197 / 406 page

 2010-2011 Microchip Technology Inc.

DS39996F-page 197

PIC24FJ128GA310 FAMILY

12.0

TIMER1

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

as the time counter for the Real-Time Clock (RTC) 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 12-1 presents a block diagram of the 16-bit

timer module.

To configure Timer1 for operation:

Set the TON bit (= 1).

Select the timer prescaler ratio using the

TCKPS<1:0> bits.

Set the Clock and Gating modes using the TCS,

TECS and TGATE bits.

Set or clear the TSYNC bit to configure

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 12-1:

16-BIT TIMER1 MODULE BLOCK DIAGRAM

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, refer to the

“PIC24F

Family

Reference

Manual

”,

Section 14. “Timers”

(DS39704). The

information in this data sheet supersedes

the information in the FRM.

TON

Sync

SOSCI

SOSCO

PR1

Set T1IF

Equal

Comparator

TMR1

Reset

SOSCEN

TSYNC

TCKPS<1:0>

TGATE

TCY

TCS

TGATE

Gate

Sync

SOSC

Input

Gate

Output

Clock

Output

to TMR1

Clock Input Select Detail

LPRC Input

T1ECS<1:0>

T1CK Input

SOSCSEL<1:0>

LPRC

Clock

Input Select

Prescaler

1, 8, 64, 256

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