Datasheet

© 2009 Microchip Technology Inc. DS70175H-page 141
PIC24HJXXXGPX06/X08/X10
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:
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.
FIGURE 12-1: 16-BIT TIMER1 MODULE BLOCK DIAGRAM
Note: This data sheet summarizes the features
of the PIC24HJXXXGPX06/X08/X10 fam-
ily of devices. However, it is not intended
to be a comprehensive reference source.
To complement the information in this data
sheet, refer to the “PIC24H Family Refer-
ence Manual”, Section 11. “Timers”
(DS70244), which is available from the
Microchip website (www.microchip.com).
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