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2009 Microchip Technology Inc.

DS39636D-page 119

PIC18F2X1X/4X1X

11.0 TIMER1 MODULE

The Timer1 timer/counter module incorporates these

features:

Software selectable operation as a 16-bit timer or

counter

Readable and writable 8-bit registers (TMR1H

and TMR1L)

Selectable clock source (internal or external) with

device clock or Timer1 oscillator internal options

Interrupt-on-overflow

Reset on CCP special event trigger

Device clock status flag (T1RUN)

A simplified block diagram of the Timer1 module is

shown in Figure 11-1. A block diagram of the module’s

operation in Read/Write mode is shown in Figure 11-2.

The module incorporates its own low-power oscillator

to provide an additional clocking option. The Timer1

oscillator can also be used as a low-power clock source

for the microcontroller in power-managed operation.

Timer1 can also be used to provide Real-Time Clock

(RTC) functionality to applications with only a minimal

addition of external components and code overhead.

Timer1 is controlled through the T1CON Control

Oscillator Enable bit (T1OSCEN). Timer1 can be

enabled or disabled by setting or clearing control bit,

TMR1ON (T1CON<0>).

REGISTER 11-1:

T1CON: TIMER1 CONTROL REGISTER

R/W-0

R-0

R/W-0

RD16

T1RUN

T1CKPS1

T1CKPS0

T1OSCEN

T1SYNC

TMR1CS

TMR1ON

bit 7

bit 0

bit 7

RD16: 16-bit Read/Write Mode Enable bit

1 = Enables register read/write of TImer1 in one 16-bit operation

0 = Enables register read/write of Timer1 in two 8-bit operations

bit 6

T1RUN: Timer1 System Clock Status bit

1 = Device clock is derived from Timer1 oscillator

0 = Device clock is derived from another source

bit 5-4

T1CKPS1:T1CKPS0: Timer1 Input Clock Prescale Select bits

11 = 1:8 Prescale value

10 = 1:4 Prescale value

01 = 1:2 Prescale value

00 = 1:1 Prescale value

bit 3

T1OSCEN: Timer1 Oscillator Enable bit

1 = Timer1 oscillator is enabled

0 = Timer1 oscillator is shut off

The oscillator inverter and feedback resistor are turned off to eliminate power drain.

bit 2

T1SYNC: Timer1 External Clock Input Synchronization Select bit

When TMR1CS = 1:

1 = Do not synchronize external clock input

0 = Synchronize external clock input

When TMR1CS = 0:

This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.

bit 1

TMR1CS: Timer1 Clock Source Select bit

1 = External clock from pin RC0/T1OSO/T13CKI (on the rising edge)

0 = Internal clock (FOSC/4)

bit 0

TMR1ON: Timer1 On bit

1 = Enables Timer1

0 = Stops Timer1

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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