PIC24HJ128GP206-I Datasheet, PDF (133/286 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
11.0 TIMER1
Note:
This data sheet summarizes the features
of this group of PIC24HJXXXGPX06/X08/
X10 devices. It is not intended to be a
comprehensive reference source. To com-
plement the information in this data sheet,
refer to the “PIC24H Family Reference
Manual”. Refer to the Microchip web site
(www.microchip.com) for the latest
PIC24H Family Reference Manual
sections.
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.
FIGURE 11-1:
16-BIT TIMER1 MODULE BLOCK DIAGRAM
SOSCO/
T1CK
SOSCI
TGATE
SOSCEN
Gate
Sync
TCY
TON
1x
01
TCKPS<1:0>
2
Prescaler
1, 8, 64, 256
00
TGATE
TCS
Set T1IF
1
0
Reset
QD
Q CK
TMR1
Equal
Comparator
0
1
TSYNC
Sync
PR1
© 2007 Microchip Technology Inc.
DS70175F-page 131