Microchip Technology Microstick for the 3V PIC24F K-series DM240013-1 DM240013-1 Data Sheet

 2011 Microchip Technology Inc.

DS31037B-page 115

The Timer1 module is a 16-bit timer which can operate
as a free-running, interval timer/counter, or serve as the
time counter for a software-based Real-Time Clock
(RTC). Timer1 is only reset on initial V

DD

 power-on

events. This allows the timer to continue operating as an
RTC clock source through other types of device Reset.
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

 illustrates a block diagram of the 16-bit

Timer1 module.
To configure Timer1 for operation:
1.

Set the TON bit (= 1).

2.

Select the timer prescaler ratio using the
TCKPS<1:0> bits.

3.

Set the Clock and Gating modes using the TCS
and TGATE bits.

4.

Set or clear the TSYNC bit to configure
synchronous or asynchronous operation.

5.

Load the timer period value into the PR1
register.

6.

If interrupts are required, set the interrupt enable
bit, T1IE. Use the priority bits, T1IP<2:0>, to set
the interrupt priority.

This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive refer-
ence source. For more information on
Timers, refer to the “PIC24F Family Refer-
ence Manual”

,  Section 14. “Timers”

(DS39704).

         

TON

Sync

SOSCI

SOSCO/

PR1

Set T1IF

Equal

Comparator

 

TMR1

Reset

SOSCEN

1

0

TSYNC

Q

Q

D

CK

TCKPS<1:0>

Prescaler

1, 8, 64, 256

2

TGATE

T

CY

1

0

T1CK

TCS

1x

01

TGATE

00

Gate

Sync