PIC16F818_13 Datasheet, PDF (129/178 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
FIGURE 15-4:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
OSC1
CLKO
1
3
3
2
Q4
Q1
4
4
TABLE 15-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKI Frequency (Note 1) DC —
1 MHz XT and RC Oscillator mode
DC —
20 MHz HS Oscillator mode
DC —
32 kHz LP Oscillator mode
Oscillator Frequency (Note 1)
DC —
4 MHz RC Oscillator mode
0.1 —
4 MHz XT Oscillator mode
4
—
20 MHz HS Oscillator mode
5
—
200 kHz LP Oscillator mode
1
TOSC External CLKI Period (Note 1)
1000 —
—
ns XT and RC Oscillator mode
50 —
—
ns HS Oscillator mode
5
—
—
ms LP Oscillator mode
Oscillator Period (Note 1)
250 —
—
ns RC Oscillator mode
250 — 10,000 ns XT Oscillator mode
50 —
250 ns HS Oscillator mode
5
—
—
ms LP Oscillator mode
2
TCY
Instruction Cycle Time (Note 1)
200 TCY
DC
ns TCY = 4/FOSC
3
TOSL, External Clock in (OSC1) High
500 —
—
ns XT Oscillator
TOSH or Low Time
2.5 —
—
ms LP Oscillator
15 —
—
ns HS Oscillator
4
TOSR, External Clock in (OSC1) Rise or
——
25
ns XT Oscillator
TOSF Fall Time
——
50
ns LP Oscillator
——
15
ns HS Oscillator
† 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:
Instruction cycle period (TCY) equals four times the input oscillator time base period. All specified values
are based on characterization data for that particular oscillator type, under standard operating conditions,
with the device executing code. Exceeding these specified limits may result in an unstable oscillator
operation and/or higher than expected current consumption. All devices are tested to operate at “min.”
values with an external clock applied to the OSC1/CLKI pin. When an external clock input is used, the
“max.” cycle time limit is “DC” (no clock) for all devices.
 2001-2013 Microchip Technology Inc.
DS39598F-page 129