PIC16C712T-04/SO 查看數據表（PDF） - Microchip Technology

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PIC16C712T-04/SO

8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM

Microchip Technology 

PIC16C712/716

FIGURE 5-2: TIMER1 BLOCK DIAGRAM

Set flag bit

TMR1IF on

Overflow

RB1/T1OSO/T1CKI

RB2/T1OSI

TMR1

0

Synchronized

clock input

TMR1H TMR1L

1

T1OSC

TMR1ON

on/off

T1SYNC

T1OSCEN FOSC/4

Enable

Oscillator(1)

Internal

Clock

1

Prescaler

1, 2, 4, 8

0

2

T1CKPS1:T1CKPS0

Synchronize

det

SLEEP input

TMR1CS

Note 1: When the T1OSCEN bit is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.

5.2 Timer1 Module and PORTB Operation

When Timer1 is configured as timer running from the

main oscillator, PORTB<2:1> operate as normal I/O

lines. When Timer1 is configured to function as a

counter however, the clock source selection may affect

the operation of PORTB<2:1>. Multiplexing details of

the Timer1 clock selection on PORTB are shown in Fig-

ure 3-4 and Figure 3-5.

The clock source for Timer1 in the counter mode can

be from one of the following:

1. External circuit connected to the

RB1/T1OSO/T1CKI pin

2. Firmware controlled DATACCP<0> bit, DT1CKI

3. Timer1 oscillator

Table 5-1 shows the details of Timer1 mode selections,

control bit settings, TMR1 and PORTB operations.

DS41106A-page 32

Preliminary

© 1999 Microchip Technology Inc.

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