PIC16C774 Microchip Technology Inc., PIC16C774 Datasheet - Page 42

• Manufacturer Part Number: PIC16C774
• Description: 28/40-pin, 8-bit Cmos Microcontrollers W/ 12-bit A/d
• Manufacturer: Microchip Technology Inc.

PIC16C77X
5.1.1
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 5-2:
FIGURE 5-3:
DS30275A-page 42
Note 1: When the T1OSCEN bit is cleared, the inverter and feedback resistor are turned off. This eliminates power drain.
RC0/T1OSO/T1CKI
RC1/T1OSI
T1CKI
(Default high)
T1CKI
(Default low)
Note: Arrows indicate counter increments.
TIMER1 COUNTER OPERATION
Set flag bit
TMR1IF on
Overflow
TIMER1 INCREMENTING EDGE
TIMER1 BLOCK DIAGRAM
TMR1H
T1OSC
TMR1
TMR1L
Oscillator
Enable
T1OSCEN
Advance Information
(1)
Clock
F
Internal
OSC
TMR1ON
/4
on/off
TMR1CS
1
0
T1CKPS1:T1CKPS0
T1SYNC
Prescaler
1, 2, 4, 8
0
1
2
Synchronized
clock input
1999 Microchip Technology Inc.
Synchronize
SLEEP input
det