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Sheet目录3861

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2010-2012 Microchip Technology Inc.

DS39977F-page 223

PIC18F66K80 FAMILY

16.0

TIMER3 MODULE

The Timer3 timer/counter modules incorporate these

features:

Software selectable operation as a 16-bit timer or

counter

Readable and writable eight-bit registers (TMR3H

and TMR3L)

Selectable clock source (internal or external) with

device clock or SOSC oscillator internal options

Interrupt-on-overflow

Module Reset on ECCP Special Event Trigger

A simplified block diagram of the Timer3 module is

shown in Figure 16-1.

The Timer3 module is controlled through the T3CON

options for the ECCP modules. (For more information,

see Section 20.1.1 “ECCP Module and Timer

Resources”

The FOSC clock source should not be used with the

ECCP capture/compare features. If the timer will be

used with the capture or compare features, always

select one of the other timer clocking options.

REGISTER 16-1:

T3CON: TIMER3 CONTROL REGISTER

R/W-0

TMR3CS1

TMR3CS0

T3CKPS1

T3CKPS0

SOSCEN

T3SYNC

RD16

TMR3ON

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 7-6

TMR3CS<1:0>:

Timer3 Clock Source Select bits

= Timer3 clock source is either from pin or oscillator, depending on the SOSCEN bit:

SOSCEN = 0:

External clock is from T3CKI pin (on the rising edge).

SOSCEN = 1:

Depending on the SOSCSELx Configuration bit, the clock source is either a crystal oscillator on

SOSCI/SOSCO or an internal digital clock from the SCLKI pin.

= Timerx clock source is system clock (FOSC)(1)

= Timerx clock source is instruction clock (FOSC/4)

bit 5-4

T3CKPS<1:0>

: Timer3 Input Clock Prescale Select bits

= 1:8 Prescale value

= 1:4 Prescale value

= 1:2 Prescale value

= 1:1 Prescale value

bit 3

SOSCEN

: SOSC Oscillator Enable bit

= SOSC is enabled and available for Timer3

= SOSC is disabled and available for Timer3

bit 2

T3SYNC:

Timer3 External Clock Input Synchronization Control bit

(Not usable if the device clock comes from Timer1/Timer3.)

When TMR3CS<1:0> = 10:

= Does not synchronize external clock input

= Synchronizes external clock input

When TMR3CS<1:0> = 0x:

This bit is ignored; Timer3 uses the internal clock.

bit 1

RD16:

16-Bit Read/Write Mode Enable bit

= Enables register read/write of Timer3 in one 16-bit operation

= Enables register read/write of Timer3 in two eight-bit operations

bit 0

TMR3ON:

Timer3 On bit

= Enables Timer3

= Stops Timer3

Note 1:

The FOSC clock source should not be selected if the timer will be used with the ECCP capture/compare features.

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