48GA004 datasheet(125/268 Pages) MICROCHIP

125 / 268 page

 2010 Microchip Technology Inc.

DS39881D-page 125

PIC24FJ64GA004 FAMILY

11.0

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 11-1 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

TCKPS1:TCKPS0 bits.

Set the Clock and Gating modes using the TCS

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, T1IP2:T1IP0, to

set the interrupt priority.

FIGURE 11-1:

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).

TON

Sync

SOSCI

SOSCO/

PR1

Set T1IF

Equal

Comparator

TMR1

Reset

SOSCEN

TSYNC

TCKPS1:TCKPS0

Prescaler

1, 8, 64, 256

TGATE

TCY

T1CK

TCS

TGATE

Gate

Sync

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