F21 datasheet(159/416 Pages) MICROCHIP

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DS30010118D-page 159

PIC24FJ256GA705 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<1:0> 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 “dsPIC33/PIC24 Family Reference

Manual”, “Timers” (DS39704), which is

available from the Microchip website

(www.microchip.com). The information in

this

data

sheet

supersedes

the

information in the FRM.

TON

Sync

SOSCI

SOSCO

PR1

Set T1IF

Equal

Comparator

Reset

SOSCEN

TSYNC

TCKPS<1:0>

TGATE

TCY

TCS

TGATE

SOSC

Input

Gate

Output

Clock Input Select Detail

LPRC Input

TECS<1:0>

T1CK Input

SOSCSEL

LPRC

Clock

Input Select

Prescaler

1, 8, 64, 256

TxCK Input

TMR1

Gate

Sync

Clock

Output

to TMR1

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