Datasheet

© 2009 Microchip Technology Inc. Preliminary DS39937B-page 101
PIC24F04KA201 FAMILY
11.0 TIMER1
The Timer1 module is a 16-bit timer which can 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 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.
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 on Timers,
refer to the “PIC24F Family Reference
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