PIC16F627A Datasheet, PDF (146/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
TABLE 17-9:
Param
No.
Sym
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
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: — — ns N = prescale
TCY + 40*
value (2, 4, ...,
N
256)
45 Tt1H T1CKI High Synchronous, No Prescaler 0.5TCY + 20* —
Time
Synchronous, PIC16F62X
15*
—
— ns
— ns
with Prescaler PIC16LF62X
25*
— — ns
Asynchronous PIC16F62X
30*
— — ns
PIC16LF62X
50*
— — ns
46 Tt1L T1CKI Low Synchronous, No Prescaler 0.5TCY + 20* —
Time
Synchronous, PIC16F62X
15*
—
— ns
— ns
with Prescaler _PIC16LF62X
25*
— — ns
Asynchronous PIC16F62X
30*
— — ns
PIC16LF62X
50*
— — ns
47 Tt1P T1CKI input Synchronous PIC16F62X Greater of: — — ns N = prescale
period
TCY + 40*
value (1, 2, 4, 8)
N
PIC16LF62X Greater of: — — —
TCY + 40*
N
Asynchronous PIC16F62X
60*
— — ns
PIC16LF62X
Ft1 Timer1 oscillator input frequency range
100*
—
— — ns
32.7⁽¹⁾ — kHz
(oscillator enabled by setting bit T1OSCEN)
48 TCKEZt Delay from external clock edge to timer
2Tosc
— 7Tosc —
mr1 increment
* 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.
DS40044A-page 144
Preliminary
 2002 Microchip Technology Inc.