PIC18C242 MICROCHIP [Microchip Technology], PIC18C242 Datasheet - Page 253

• Manufacturer Part Number: PIC18C242
• Description: High-Performance Microcontrollers with 10-Bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

21.4.3
FIGURE 21-5: EXTERNAL CLOCK TIMING
TABLE 21-4:
Param. No.
1A
1
2
3
4
Note 1: Instruction cycle period (T
7/99 Microchip Technology Inc.
CLKOUT
OSC1
TIMING DIAGRAMS AND SPECIFICATIONS
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/CLKIN pin. When an external clock input is used, the "Max." cycle time limit is
"DC" (no clock) for all devices.
Symbol Characteristic
Fosc
Tosc
T
TosL,
TosH
TosR,
TosF
CY
EXTERNAL CLOCK TIMING REQUIREMENTS
Q4
External CLKIN
Frequency
Oscillator Frequency
External CLKIN Period
Oscillator Period
Instruction Cycle Time
External Clock in (OSC1)
High or Low Time
External Clock in (OSC1)
Rise or Fall Time
(1)
CY
) equals four times the input oscillator time-base period. All specified values are
Q1
(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
100
7.5
40
40
10
40
40
25
10
—
—
—
—
—
—
—
—
—
—
—
20
50
4
4
3
Units Conditions
MHz XT 0osc
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 mode
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
PIC18CXX2
= 4/F
4
OSC
DS39026B-page 253
Q1