PIC16C712 datasheet(33/108 Pages) MICROCHIP

33 / 108 page

PIC16C712/716

Preliminary

DS41106A-page 33

TABLE 5-1

TMR1 MODULE AND PORTB OPERATION

TMR1

Module

Mode

Clock Source

Control Bits

TMR1 Module Operation

PORTB<2:1> Operation

Off

N/A

T1CON = --xx 0x00

Off

PORTB<2:1> function as normal

I/O

Timer

Fosc/4

T1CON = --xx 0x01

TMR1 module uses the main

oscillator as clock source.

TMR1ON can turn on or turn off

Timer1.

PORTB<2:1> function as normal

I/O

Counter

External circuit

T1CON = --xx 0x11

TR1SCCP = ---- -x-1

TMR1 module uses the external

signal on the

RB1/T1OSO/T1CKI pin as a

clock source. TMR1ON can turn

on or turn off Timer1. DT1CK

can read the signal on the

RB1/T1OSO/T1CKI pin.

PORTB<2> functions as normal

I/O. PORTB<1> always reads 0

when configured as input . If

PORTB<1> is configured as out-

put, reading PORTB<1> will read

the data latch. Writing to

PORTB<1> will always store the

result in the data latch, but not to

the RB1/T1OSO/T1CKI pin. If

the TMR1CS bit is cleared

(TMR1 reverts to the timer

mode), then pin PORTB<1> will

be driven with the value in the

data latch.

Firmware

T1CON = --xx 0x11

TR1SCCP = ---- -x-0

DATACCP<0> bit drives

RB1/T1OSO/T1CKI and pro-

duces the TMR1 clock source.

TMR1ON can turn on or turn off

Timer1. The DATACCP<0> bit,

DT1CK, can read and write to

the RB1/T1OSO/T1CKI pin.

Timer1 oscillator T1CON = --xx 1x11

RB1/T1OSO/T1CKI and

RB2/T1OSI are configured as a

2 pin crystal oscillator.

RB1/T1OSI/T1CKI is the clock

input for TMR1. TMR1ON can

turn on or turn off Timer1.

DATACCP<1> bit, DT1CK,

always reads 0 as input and can

not write to the

RB1/T1OSO/T1CK1 pin.

PORTB<2:1> always read 0

when configured as inputs. If

PORTB<2:1> are configured as

outputs, reading PORTB<2:1>

will read the data latches. Writing

to PORTB<2:1> will always store

the result in the data latches, but

not to the RB2/T1OSI and

RB1/T1OSO/T1CKI pins. If the

TMR1CS and T1OSCEN bits are

cleared (TMR1 reverts to the

timer mode and TMR1 oscillator

is disabled), then pin

PORTB<2:1> will be driven with

the value in the data latches.

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