PIC16F819T-E Datasheet, PDF (136/176 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
FIGURE 15-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
RA4/T0CKI
40
41
42
RB6/T1OSO/T1CKI
45
46
TMR0 or TMR1
47
48
Note: Refer to Figure 15-3 for load conditions.
TABLE 15-4: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typ† Max Units Conditions
40* TT0H
41* TT0L
42* TT0P
T0CKI High Pulse Width
T0CKI Low Pulse Width
T0CKI Period
No Prescaler
0.5 TCY + 20 — — ns Must also meet
With Prescaler
10
—
—
ns ^{parameter 42}
No Prescaler
0.5 TCY + 20 — — ns Must also meet
With Prescaler
10
—
—
ns ^{parameter 42}
No Prescaler
TCY + 40
— — ns
With Prescaler Greater of: — — ns N = prescale value
20 or TCY + 40
(2, 4, ..., 256)
N
45* TT1H
46* TT1L
T1CKI High
Time
Synchronous, Prescaler = 1
0.5 TCY + 20 — — ns Must also meet
Synchronous, PIC16F818/819
15
—
—
ns ^{parameter 47}
Prescaler = 2,4,8 _{PIC16LF818/819}
25
— — ns
Asynchronous PIC16F818/819
30
— — ns
PIC16LF818/819
50
— — ns
T1CKI Low Time Synchronous, Prescaler = 1
0.5 TCY + 20 — — ns Must also meet
Synchronous, PIC16F818/819
15
—
—
ns ^{parameter 47}
Prescaler = 2,4,8 _{PIC16LF818/819}
25
— — ns
Asynchronous PIC16F818/819
30
— — ns
PIC16LF818/819
50
— — ns
47* TT1P
T1CKI Input
Period
Synchronous
PIC16F818/819 Greater of: — — ns N = prescale
30 or TCY + 40
value (1, 2, 4, 8)
N
PIC16LF818/819 Greater of:
50 or TCY + 40
N
N = prescale
value (1, 2, 4, 8)
Asynchronous PIC16F818/819
60
— — ns
PIC16LF818/819
100
— — ns
FT1
Timer1 Oscillator Input Frequency Range
(Oscillator enabled by setting bit T1OSCEN)
DC
— 32.768 kHz
48
TCKEZTMR1 Delay from External Clock Edge to Timer Increment
2 TOSC
— 7 TOSC —
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.
DS39598E-page 134
 2004 Microchip Technology Inc.