Microchip Technology MA330011 Data Sheet

©

 2007 Microchip Technology Inc.

DS70165E-page 161

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 11-1 presents a block diagram of the 16-bit timer
module.

To configure Timer1 for operation:

1.

Set the TON bit (= 

1

) in the T1CON register.

2.

Select the timer prescaler ratio using the
TCKPS<1:0> bits in the T1CON register.

3.

Set the Clock and Gating modes using the TCS
and TGATE bits in the T1CON register.

4.

Set or clear the TSYNC bit in T1CON to select
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 dsPIC33F devices. It is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to the “dsPIC30F
Family Reference Manual” (DS70046).

         

TON 

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

Sync

Gate
Sync