PIC24FJ64GA705 Datasheet, PDF (159/412 Pages) –

PIC24FJ256GA705 FAMILY
12.0 TIMER1
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, refer to
the “dsPIC33/PIC24 Family Reference
Manual”, “Timers” (DS39704), which is
available from the Microchip web site
(www.microchip.com). The information in
this data sheet supersedes the
information in the FRM.
The Timer1 module is a 16-bit timer, which can serve
as the time counter for the Real-Time Clock (RTC) 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).
2. Select the timer prescaler ratio using the
TCKPS<1:0> bits.
3. Set the Clock and Gating modes using the TCS,
TECS<1:0> 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 12-1:
LPRC
SOSCO
16-BIT TIMER1 MODULE BLOCK DIAGRAM
Clock
Input Select
DQ
CK Q
TGATE
1
Set T1IF
0
SOSCI
TMR1
Reset
SOSCSEL
SOSCEN
Clock Input Select Detail
SOSC
Input
TECS<1:0>
2
T1CK Input
LPRC Input
TxCK Input
Gate
Sync
TCY
TGATE
TCS
TON
Comparator
Equal
PR1
TCKPS<1:0>
2
Prescaler
1, 8, 64, 256
Gate
Output
0
Sync
1
Clock
Output
to TMR1
TSYNC
 2016 Microchip Technology Inc.
DS30010118B-page 159