Datasheet

 2010 Microchip Technology Inc. DS39616D-page 139
PIC18F2331/2431/4331/4431
15.0 TIMER5 MODULE
The Timer5 module implements these features:
• 16-bit timer/counter operation
• Synchronous and Asynchronous Counter modes
• Continuous Count and Single-Shot Operating modes
• Four programmable prescaler values (1:1 to 1:8)
• Interrupt generated on period match
• Special Event Trigger Reset function
• Double-buffered registers
• Operation during Sleep
• CPU wake-up from Sleep
• Selectable hardware Reset input with a wake-up
feature
Timer5 is a general purpose timer/counter that incor-
porates additional features for use with the Motion
Feedback Module (see Section 17.0 “Motion Feed-
back Module”). It may also be used as a general
purpose timer or a Special Event Trigger delay timer.
When used as a general purpose timer, it can be
configured to generate a delayed Special Event Trigger
(e.g., an ADC Special Event Trigger) using a
preprogrammed period delay.
Timer5 is controlled through the Timer5 Control register
(T5CON), shown in Register 15-1. The timer can be
enabled or disabled by setting or clearing the control bit
TMR5ON (T5CON<0>).
A block diagram of Timer5 is shown in Figure 15-1.
REGISTER 15-1: T5CON: TIMER5 CONTROL REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
T5SEN RESEN
(1)
T5MOD T5PS1 T5PS0 T5SYNC
(2)
TMR5CS TMR5ON
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 T5SEN: Timer5 Sleep Enable bit
1 = Timer5 is enabled during Sleep
0 = Timer5 is disabled during Sleep
bit 6 RESEN
: Special Event Trigger Reset Enable bit
(1)
1 = Special Event Trigger Reset is disabled
0 = Special Event Trigger Reset is enabled
bit 5 T5MOD: Timer5 Mode bit
1 = Single-Shot mode is enabled
0 = Continuous Count mode is enabled
bit 4-3 T5PS<1:0>: Timer5 Input Clock Prescale Select bits
11 = 1:8
10 = 1:4
01 = 1:2
00 = 1:1
bit 2 T5SYNC
: Timer5 External Clock Input Synchronization Select bit
(2)
When TMR5CS = 1:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMR5CS =
0:
This bit is ignored. Timer5 uses the internal clock when TMR5CS = 0.
bit 1 TMR5CS: Timer5 Clock Source Select bit
1 = External clock from the T5CKI pin
0 = Internal clock (T
CY)
bit 0 TMR5ON: Timer5 On bit
1 = Timer5 is enabled
0 = Timer5 is disabled
Note 1: These bits are not implemented on PIC18F2331/2431 devices and read as ‘0’.
2: For Timer5 to operate during Sleep mode, T5SYNC
must be set.