PIC16C770 Datasheet

  • PIC16C770

  • 18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-bit A/D

  • 3585.57KB

  • 220页

  • MICROCHIP

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PIC16C717/770/771
6.1.1
TIMER1 COUNTER OPERATION
In this mode, Timer1 is being incremented via an exter-
nal source. Increments occur on a rising edge. After
Timer1 is enabled in counter mode, the module must
first have a falling edge before the counter begins to
increment.
FIGURE 6-1:
T1CKI
(Initially high)
TIMER1 INCREMENTING EDGE
First falling edge
of the T1ON enabled
T1CKI
(Initially low)
First falling edge
of the T1ON enabled
Note:
Arrows indicate counter increments.
FIGURE 6-2:
TIMER1 BLOCK DIAGRAM
Set flag bit
TMR1IF on
Overflow
TMR1H
TMR1
TMR1L
0
1
TMR1ON
on/off
T1SYNC
Synchronized
clock input
T1OSC
RB6/T1OSO/T1CKI/P1C
T1OSCEN F
OSC
/4
Enable
Internal
Oscillator
(1)
Clock
1
Prescaler
1, 2, 4, 8
0
2
T1CKPS<1:0>
TMR1CS
SLEEP input
Synchronize
det
RB7/T1OSI/P1D
Note 1:
When the T1OSCEN bit is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
DS41120A-page 50
Advanced Information
1999 Microchip Technology Inc.

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