70592C datasheet(147/314 Pages) MICROCHIP

147 / 314 page

DS70592C-page 147

PIC24HJXXXGPX06A/X08A/X10A

12.0 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 12-1 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 12-1:

16-BIT TIMER1 MODULE BLOCK DIAGRAM

Note 1: This data sheet summarizes the features

of the PIC24HJXXXGPX06A/X08A/X10A

family of devices. However, it is not

intended to be a comprehensive refer-

ence source. To complement the infor-

mation in this data sheet, refer to Section

11.

“Timers”

(DS70244)

the

“dsPIC33F/PIC24H Family Reference

Manual”, which is available from the

Microchip website (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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