PIC18LF4331 datasheet(139/392 Pages) MICROCHIP

139 / 392 page

 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.

T5CON: TIMER5 CONTROL REGISTER

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

= Timer5 is enabled during Sleep

= Timer5 is disabled during Sleep

bit 6

RESEN:

Special Event Trigger Reset Enable bit(1)

= Special Event Trigger Reset is disabled

= Special Event Trigger Reset is enabled

bit 5

T5MOD:

Timer5 Mode bit

= Single-Shot mode is enabled

= Continuous Count mode is enabled

bit 4-3

T5PS<1:0>:

Timer5 Input Clock Prescale Select bits

= 1:8

= 1:4

= 1:2

= 1:1

bit 2

T5SYNC:

Timer5 External Clock Input Synchronization Select bit(2)

When TMR5CS = 1:

= Do not synchronize external clock input

= 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

= External clock from the T5CKI pin

= Internal clock (TCY)

bit 0

TMR5ON:

Timer5 On bit

= Timer5 is enabled

= Timer5 is disabled

Note 1:

These bits are not implemented on PIC18F2331/2431 devices and read as ‘0’.

For Timer5 to operate during Sleep mode, T5SYNC must be set.

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