PIC18F2331/2431/4331/4431
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.
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
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
preprogrammed period delay.
a
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
RESEN(1)
R/W-0
R/W-0
T5PS1
R/W-0
T5PS0
R/W-0
T5SYNC(2)
R/W-0
R/W-0
T5SEN
T5MOD
TMR5CS
TMR5ON
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘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
bit 0
TMR5CS: Timer5 Clock Source Select bit
1= External clock from the T5CKI pin
0= Internal clock (TCY)
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.
2010 Microchip Technology Inc.
DS39616D-page 139
MICROCHIP [ MICROCHIP ]
