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Sheet目录3841

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2010-2012 Microchip Technology Inc.

DS39977F-page 209

PIC18F66K80 FAMILY

14.0

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 SOSC oscillator internal options

Interrupt-on-overflow

Reset on ECCP Special Event Trigger

Timer with gated control

Figure 14-1 displays a simplified block diagram of the

Timer1 module.

The module derives its clocking source from either the

secondary oscillator or from an external digital source.

If using the secondary oscillator, there are the addi-

tional options for low-power, high-power and external

digital clock source.

Timer1 is controlled through the T1CON Control

Oscillator Enable bit (SOSCEN). Timer1 can be

enabled or disabled by setting or clearing control bit,

TMR1ON (T1CON<0>).

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 14-1:

T1CON: TIMER1 CONTROL REGISTER

R/W-0

TMR1CS1

TMR1CS0

T1CKPS1

T1CKPS0

SOSCEN

T1SYNC

RD16

TMR1ON

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

TMR1CS<1:0>:

Timer1 Clock Source Select bits

= Timer1 clock source is either from pin or oscillator, depending on the SOSCEN bit:

SOSCEN = 0:

External clock is from the T1CKI 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.

= Timer1 clock source is the system clock (FOSC)(1)

= Timer1 clock source is the instruction clock (FOSC/4)

bit 5-4

T1CKPS<1:0>:

Timer1 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 Timer1

= SOSC is disabled for Timer1

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

bit 2

T1SYNC:

Timer1 External Clock Input Synchronization Select bit

TMR1CS<1:0> = 10:

= Do not synchronize external clock input

= Synchronizes external clock input

TMR1CS<1:0> = 0x:

This bit is ignored. Timer1 uses the internal clock when TMR1CS<1:0> = 1x.

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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