PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 339

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

27.3.3
FIGURE 27-5:
TABLE 27-6:
1A
1
2
3
4
Note 1: Instruction cycle period (T
Param No. Symbol
2002 Microchip Technology Inc.
OSC1
CLKO
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
F
T
T
TosL,
TosH
TosR,
TosF
OSC
CY
OSC
EXTERNAL CLOCK TIMING REQUIREMENTS
EXTERNAL CLOCK TIMING
Q4
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
Characteristic
CY
) equals four times the input oscillator time-base period. All specified values are
Q1
(1)
1
(1)
(1)
(1)
(1)
Preliminary
Q2
Min
250
100
250
250
100
100
DC
DC
DC
DC
DC
0.1
2.5
40
40
30
10
—
—
—
4
4
4
5
5
5
5
2
3
10,000
10,000
Max
Q3
200
200
100
7.5
25
10
40
25
10
20
50
—
—
—
—
—
—
—
—
—
—
—
4
4
4
3
Units
MHz XT osc
MHz HS osc
MHz HS + PLL osc
MHz
MHz RC osc
MHz XT osc
MHz HS osc
MHz HS + PLL osc
kHz
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
Q4
4
LP osc
EC
LP osc
XT and RC osc
HS osc
HS + PLL osc
LP osc
EC
RC osc
XT osc
HS osc
HS + PLL osc
LP osc
T
XT osc
LP osc
HS osc
XT osc
LP osc
HS osc
CY
PIC18FXX8
= 4/F
4
OSC
Conditions
DS41159B-page 337
Q1