PIC18F4539-ESLASHMLSQTP datasheet(111/322 Pages) MICROCHIP

111 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 109

PIC18FXX39

13.0 TIMER3 MODULE

The Timer3 module timer/counter has the following

features:

• 16-bit timer/counter

(two 8-bit registers: TMR3H and TMR3L)

• Readable and writable (both registers)

• Internal or external clock select

• Interrupt-on-overflow from FFFFh to 0000h

Figure 13-1 is a simplified block diagram of the Timer3

module.

sets the Operating mode of the Timer1 module.

T3CON: TIMER3 CONTROL REGISTER

R/W-0

RD16

—

T3CKPS1 T3CKPS0

—

T3SYNC

TMR3CS TMR3ON

bit 7

bit 0

bit 7

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 8-bit operations

bit 6, 3

Unimplemented: Maintain as ‘0’

bit 5, 4

T3CKPS1:T3CKPS0: Timer3 Input Clock Prescale Select bits

= 1:8 Prescale value

= 1:4 Prescale value

= 1:2 Prescale value

= 1:1 Prescale value

bit 2

T3SYNC: Timer3 External Clock Input Synchronization Control bit

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

When TMR3CS = 1:

= Do not synchronize external clock input

= Synchronize external clock input

When TMR3CS = 0:

This bit is ignored. Timer3 uses the internal clock when TMR3CS = 0.

bit 1

TMR3CS: Timer3 Clock Source Select bit

= External clock input from T13CKI

(on the rising edge after the first falling edge)

= Internal clock (FOSC/4)

bit 0

TMR3ON: Timer3 On bit

= Enables Timer3

= Stops Timer3

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

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