© 2010 Microchip Technology Inc. DS70205C-page 11-25
Section 11. Timers
Timers
11
11.12 REVISION HISTORY
Revision A (April 2007)
This is the initial released revision of this document.
Revision B (April 2008)
This revision incorporates the following updates:
• Notes:
- Added a note in 11.4.3 “Synchronous Counter Mode”, which provides information
on timer operation when configured for External Counter mode (TCS = 1)
- Corrected Note 2 in Figure 11-6. TMR5:TMR2 is changed to TMR5:TMR4
• Additional minor corrections such as language and formatting updates are incorporated
throughout the document.
Revision C (January 2010)
This revision incorporates the following updates:
• Renamed the Family Reference Manual name from dsPIC33F to dsPIC33F/PIC24H
• All references to dsPIC33F in the document are updated to dsPIC33F/PIC24H
• Changed all instances of __shadow__ to no_auto_psv in the code examples
• Added latch block to Figure 11-1, Figure 11-2, Figure 11-3 and Figure 11-6
• Notes:
- Added a shaded note at the beginning of the section, which provides information on
complimentary documentation
- Added the following note in 11.4.1 “Timer Mode”:
• The PRx register resets one timer clock period only after the TxIF bit is set
- Added the following note in 11.4.3 “Synchronous Counter Mode” and
11.4.4 “Asynchronous Counter Mode (Type A Timer only)”:
• The PRx register resets on the subsequent rising edge of the timer clock input
- Added the following notes in 11.4.1 “Timer Mode”, 11.4.3 “Synchronous Counter
Mode”, and 11.4.4 “Asynchronous Counter Mode (Type A Timer only)”:
• The TxIF bit is set one instruction cycle after a period match.
• The timer counts PRx times for the first TxIF event and (PRx + 1) times for all subse-
quent TxIF events. For applications in which the asymmetry in interrupt timing is not
acceptable, it is recommended to ignore the first TxIF event after enabling the timer.
• Removed Table 11-5: Interrupt Control Register Map
• Additional minor corrections such as language and formatting updates are incorporated
throughout the document
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