PIC16F627A_05 Datasheet, PDF (150/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
TABLE 17-8: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
Sym
Characteristic
Min
Typ† Max Units Conditions
40
TT0H T0CKI High Pulse Width ^{No Prescaler}
0.5TCY + 20*
— — ns
With Prescaler
10*
— — ns
41
TT0L T0CKI Low Pulse Width No Prescaler
0.5TCY + 20*
— — ns
With Prescaler
10*
— — ns
42
TT0P T0CKI Period
Greater of: —
20 or TCY + 40*
N
— ns N = prescale
value (2, 4,
..., 256)
45
TT1H T1CKI High Synchronous, No Prescaler
0.5TCY + 20*
— — ns
Time
Synchronous, PIC16F62XA
15*
— — ns
with Prescaler _PIC16LF62XA
25*
— — ns
Asynchronous PIC16F62XA
30*
— — ns
PIC16LF62XA
50*
— — ns
46
TT1L T1CKI Low Synchronous, No Prescaler
0.5TCY + 20*
— — ns
Time
Synchronous, PIC16F62XA
15*
— — ns
with Prescaler _PIC16LF62XA
25*
— — ns
Asynchronous PIC16F62XA
30*
— — ns
PIC16LF62XA
50*
— — ns
47
TT1P T1CKI input Synchronous PIC16F62XA
Greater of: — — ns N = prescale
period
20 or TCY + 40*
value (1, 2,
N
4, 8)
PIC16LF62XA
Greater of: —
20 or TCY + 40*
N
——
Asynchronous PIC16F62XA
60*
— — ns
PIC16LF62XA
FT1 Timer1 oscillator input frequency range
(oscillator enabled by setting bit
T1OSCEN)
100*
—
— — ns
32.7⁽¹⁾ — kHz
48 TCKEZTMR1 Delay from external clock edge to timer
increment
2TOSC
— 7TOSC —
* 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.
Note 1: This oscillator is intended to work only with 32.768 kHz watch crystals and their manufactured tolerances.
Higher value crystal frequencies may not be compatible with this crystal driver.
DS40044D-page 148
© 2005 Microchip Technology Inc.