PIC18FXX8 Datasheet, PDF (345/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

27.3.3 TIMING DIAGRAMS AND SPECIFICATIONS
FIGURE 27-6:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
OSC1
CLKO
1
3
3
2
PIC18FXX8
Q4
Q1
4
4
TABLE 27-6: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Max Units
Conditions
1A
FOSC External CLKI Frequency⁽¹⁾
DC
Oscillator Frequency⁽¹⁾
DC
40
MHz EC, ECIO oscillator, -40°C to +85°C
25
MHz EC, ECIO oscillator, +85°C to +125°C
DC
4
MHz RC oscillator
0.1
4
MHz XT oscillator
4
25
MHz HS oscillator, -40°C to +85°C
4
25
MHz HS oscillator, +85°C to +125°C
4
10
MHz HS + PLL oscillator, -40°C to +85°C
4
6.25 MHz HS + PLL oscillator, +85°C to +125°C
1
TOSC External CLKI Period⁽¹⁾
Oscillator Period⁽¹⁾
DC
200
kHz LP oscillator
25
—
ns EC, ECIO oscillator, -40°C to +85°C
40
—
ns EC, ECIO oscillator, +85°C to +125°C
250
—
ns RC oscillator
250
10,000 ns XT oscillator
40
—
ns HS oscillator, -40°C to +85°C
40
—
ns HS oscillator, +85°C to +125°C
100
250
ns HS + PLL oscillator, -40°C to +85°C
160
250
ns HS + PLL oscillator, +85°C to +125°C
5
200
µs LP oscillator
2
TCY
Instruction Cycle Time⁽¹⁾
100
—
ns TCY = 4/FOSC, -40°C to +85°C
160
—
ns TCY = 4/FOSC, +85°C to +125°C
3
TosL, External Clock in (OSC1)
30
TosH High or Low Time
2.5
—
ns XT oscillator
—
ns LP oscillator
10
—
µs HS oscillator
4
TosR, External Clock in (OSC1)
—
TosF Rise or Fall Time
—
20
ns XT oscillator
50
ns LP oscillator
—
7.5
ns HS oscillator
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.
 2004 Microchip Technology Inc.
DS41159D-page 343