PIC24FJ128GA MICROCHIP [Microchip Technology], PIC24FJ128GA Datasheet - Page 103

• Manufacturer Part Number: PIC24FJ128GA
• Description: General Purpose, 16-Bit Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

10.0
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
• Interrupt on 16-bit period register match or falling
FIGURE 10-1:
© 2006 Microchip Technology Inc.
Note:
modes
edge of external gate signal
TIMER1
SOSCO/
This data sheet summarizes the features
of this group of PIC24FJ devices. It is not
intended to be a comprehensive reference
source.
SOSCI
T1CK
Set T1IF
16-BIT TIMER1 MODULE BLOCK DIAGRAM
TGATE
1
0
Reset
Equal
SOSCEN
Comparator
TMR1
PR1
Preliminary
Q
Q
PIC24FJ128GA FAMILY
Gate
Sync
CK
T
CY
D
Figure 10-1 presents a block diagram of the 16-bit
timer module.
To configure Timer1 for operation:
1.
2.
3.
4.
5.
6.
Set the TON bit (= 1).
Select the timer prescaler ratio using the
TCKPS1:TCKPS0 bits.
Set the Clock and Gating modes using the TCS
and TGATE bits.
Set or clear the TSYNC bit to configure
synchronous or asynchronous operation.
Load the timer period value into the PR1
register.
If interrupts are required, set the interrupt enable
bit, T1IE. Use the priority bits, T1IP2:T1IP0, to
set the interrupt priority.
TSYNC
1x
01
00
0
1
TON
TGATE
TCS
Sync
TCKPS1:TCKPS0
1, 8, 64, 256
Prescaler
2
DS39747C-page 101