PIC18F248-E/L MICROCHIP [Microchip Technology], PIC18F248-E/L Datasheet - Page 345

• Manufacturer Part Number: PIC18F248-E/L
• Description: 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

27.3.3
FIGURE 27-6:
TABLE 27-6:
© 2006 Microchip Technology Inc.
1A
1
2
3
4
Note 1:
Param
No.
OSC1
CLKO
F
T
T
TosL,
TosH
TosR,
TosF
Symbol
OSC
CY
OSC
Instruction cycle period (T
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.
TIMING DIAGRAMS AND SPECIFICATIONS
EXTERNAL CLOCK TIMING REQUIREMENTS
External CLKI Frequency
Oscillator Frequency
External CLKI Period
Oscillator Period
Instruction Cycle Time
External Clock in (OSC1)
High or Low Time
External Clock in (OSC1)
Rise or Fall Time
EXTERNAL CLOCK TIMING
Q4
Characteristic
(1)
CY
(1)
) equals four times the input oscillator time base period. All specified values
(1)
Q1
(1)
1
(1)
Min
250
250
100
160
100
160
DC
DC
DC
DC
0.1
2.5
25
40
40
40
30
10
—
—
—
4
4
4
4
5
Q2
2
10,000
Max
6.25
200
250
250
200
7.5
40
25
25
25
10
20
—
—
—
—
—
—
—
—
—
—
50
4
4
3
Q3
Units
MHz EC, ECIO oscillator, -40°C to +85°C
MHz EC, ECIO oscillator, +85°C to +125°C
MHz RC oscillator
MHz XT oscillator
MHz HS oscillator, -40°C to +85°C
MHz HS oscillator, +85°C to +125°C
MHz HS + PLL oscillator, -40°C to +85°C
MHz HS + PLL oscillator, +85°C to +125°C
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3
s
s
LP oscillator
EC, ECIO oscillator, -40°C to +85°C
EC, ECIO oscillator, +85°C to +125°C
RC oscillator
XT oscillator
HS oscillator, -40°C to +85°C
HS oscillator, +85°C to +125°C
HS + PLL oscillator, -40°C to +85°C
HS + PLL oscillator, +85°C to +125°C
LP oscillator
T
T
XT oscillator
LP oscillator
HS oscillator
XT oscillator
LP oscillator
HS oscillator
CY
CY
= 4/F
= 4/F
Q4
4
PIC18FXX8
OSC
OSC
Conditions
4
, -40°C to +85°C
, +85°C to +125°C
DS41159E-page 343
Q1