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Sheet目录1917

81页 82页 83页 84页 [85页]86页 87页 88页 89页

PIC18F46J11 FAMILY

DS39932D-page 204

2011 Microchip Technology Inc.

13.2

Timer1 Operation

The Timer1 module is an 8-bit or 16-bit incrementing

counter,

which

accessed

through

the

TMR1H:TMR1L register pair.

When used with an internal clock source, the module is

a timer and increments on every instruction cycle.

When used with an external clock source, the module

can be used as either a timer or counter and

increments on every selected edge of the external

source.

Timer1 is enabled by configuring the TMR1ON and

TMR1GE bits in the T1CON and T1GCON registers,

respectively.

When Timer1 is enabled, the RC1/T1OSI/RP12 and

RC0/T1OSO/T1CKI/RP11 pins become inputs. This

means the values of TRISC<1:0> are ignored and the

pins are read as ‘0’.

13.3

Clock Source Selection

The TMR1CS<1:0> and T1OSCEN bits of the T1CON

When switching clock sources and using the clock

prescaler, write to TMR1L afterwards to reset the

internal prescaler count to 0.

13.3.1

INTERNAL CLOCK SOURCE

When the internal clock source is selected, the

TMR1H:TMR1L register pair will increment on multiples

of FOSC as determined by the Timer1 prescaler.

13.3.2

EXTERNAL CLOCK SOURCE

When the external clock source is selected, the Timer1

module may work as a timer or a counter.

When enabled to count, Timer1 is incremented on the

rising edge of the external clock input, T1CKI, or the

capacitive sensing oscillator signal. Either of these

external clock sources can be synchronized to the

microcontroller system clock or they can run

asynchronously.

When used as a timer with a clock oscillator, an

external 32.768 kHz crystal can be used in conjunction

with the dedicated internal oscillator circuit.

TABLE 13-1:

TIMER1 CLOCK SOURCE SELECTION

Note:

In Counter mode, a falling edge must be

registered by the counter prior to the first

incrementing rising edge after any one or

more of the following conditions:

Timer1 enabled after POR Reset

Write to TMR1H or TMR1L

Timer1 is disabled

Timer1 is disabled (TMR1ON = 0)

when T1CKI is high, then Timer1 is

enabled (TMR1ON = 1) when T1CKI is

low.

TMR1CS1

TMR1CS0

T1OSCEN

Clock Source

Clock Source (FOSC)

Instruction Clock (FOSC/4)

External Clock on T1CKI Pin

Oscillator Circuit on T1OSI/T1OSO Pin

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