pic24hj16gp304 Microchip Technology Inc., pic24hj16gp304 Datasheet - Page 121

• Manufacturer Part Number: pic24hj16gp304
• Description: High-performance, 16-bit Microcontrollers
• Manufacturer: Microchip Technology Inc.

11.0
The Timer2/3 feature has 32-bit timers that can also be
configured as two independent 16-bit timers with
selectable operating modes.
As a 32-bit timer, the Timer2/3 feature permits opera-
tion in three modes:
• Two Independent 16-bit timers (Timer2 and
• Single 32-bit timer (Timer2/3)
• Single 32-bit synchronous counter (Timer2/3)
The Timer2/3 feature also supports:
• Timer gate operation
• Selectable Prescaler Settings
• Timer operation during Idle and Sleep modes
• Interrupt on a 32-bit Period Register Match
• Time Base for Input Capture and Output Compare
• ADC1 Event Trigger (Timer2/3 only)
Individually, all eight of the 16-bit timers can function as
synchronous timers or counters. They also offer the
features that are listed above, except for the event trig-
ger. The operating modes and enabled features are
determined by setting the appropriate bit(s) in the
T2CON and T3CON registers. T2CON registers are
shown in generic form in Register 11-1. T3CON regis-
ters are shown in Register 11-2.
For 32-bit timer/counter operation, Timer2 is the Least
Significant word, and Timer3 is the Most Significant
word of the 32-bit timers.
© 2007 Microchip Technology Inc.
Note:
Timer3) with all 16-bit operating modes (except
Asynchronous Counter mode)
Modules (Timer2 and Timer3 only)
Note:
TIMER2/3 FEATURE
This data sheet summarizes the features
of
PIC24HJ16GP304 devices. It is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to the “PIC24H
Family Reference Manual”.
For 32-bit operation, T3CON control bits
are ignored. Only T2CON control bit is
used for setup and control. Timer2 clock
and gate inputs are used for the 32-bit
timer modules, but an interrupt is gener-
ated with the Timer3 interrupt flags.
PIC24HJ32GP202/204 and PIC24HJ16GP304
the
PIC24HJ32GP202/204
and
Preliminary
11.1
To configure the Timer2/3 feature for 32-bit operation:
1.
2.
3.
4.
5.
6.
The timer value at any point is stored in the register pair
TMR3:TMR2. TMR3 always contains the Most Signifi-
cant word of the count, while TMR2 contains the Least
Significant word.
To configure any of the timers for individual 16-bit
operation:
1.
2.
3.
4.
5.
6.
Set the corresponding T32 control bit.
Select the prescaler ratio for Timer2 using the
TCKPS<1:0> bits.
Set the Clock and Gating modes using the
corresponding TCS and TGATE bits.
Load the timer period value. PR3 contains the
Most Significant word of the value, while PR2
contains the Least Significant word.
Set the interrupt enable bit T3IE, if interrupts are
required. Use the priority bits T3IP<2:0> to set
the interrupt priority. While Timer2 controls the
timer, the interrupt appears as a Timer3 inter-
rupt.
Set the corresponding TON bit.
Clear the T32 bit corresponding to that timer.
Select the timer prescaler ratio using the
TCKPS<1:0> bits.
Set the Clock and Gating modes using the TCS
and TGATE bits.
Load the timer period value into the PRx
register.
If interrupts are required, set the interrupt enable
bit, TxIE. Use the priority bits, TxIP<2:0>, to set
the interrupt priority.
Set the TON bit.
32-bit Operation
DS70289A-page 119