PIC18F2220 Datasheet, PDF (327/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
26.4.3 TIMING DIAGRAMS AND SPECIFICATIONS
FIGURE 26-6:
EXTERNAL CLOCK TIMING (ALL MODES EXCEPT PLL)
Q4
Q1
Q2
Q3
Q4
Q1
OSC1
CLKO
1
3
3
4
4
2
TABLE 26-6: EXTERNAL CLOCK TIMING REQUIREMENTS
Param.
No.
Symbol
Characteristic
Min
Max
Units
Conditions
1A
FOSC
External CLKI Frequency⁽¹⁾
DC
40
MHz EC, ECIO (industrial)
Oscillator Frequency⁽¹⁾
DC
25
MHz EC, ECIO (extended)
DC
4
MHz RC osc
0.1
1
MHz XT osc
4
25
MHz HS osc
4
10
MHz HS + PLL osc (industrial)
4
6.25
MHz HS + PLL osc (extended)
5
33
kHz LP Osc mode
1
TOSC
External CLKI Period⁽¹⁾
25
—
ns EC, ECIO (industrial)
Oscillator Period⁽¹⁾
40
—
ns EC, ECIO (extended)
250
—
ns RC osc
1
—
µs XT osc
40
250
ns HS osc
100
250
ns HS + PLL osc (industrial)
160
250
ns HS + PLL osc (extended)
30
—
µs LP osc
2
TCY
Instruction Cycle Time⁽¹⁾
100
160
—
ns TCY = 4/FOSC (industrial)
—
ns TCY = 4/FOSC (extended)
3
TOSL, External Clock in (OSC1)
30
TOSH
High or Low Time
2.5
—
ns XT osc
—
µs LP osc
10
—
ns HS osc
4
TOSR, External Clock in (OSC1)
—
TOSF
Rise or Fall Time
—
20
ns XT osc
50
ns LP osc
—
7.5
ns HS osc
Note 1:
Instruction cycle period (TCY) equals four times the input oscillator time base period for all configurations
except PLL. 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.
 2003 Microchip Technology Inc.
DS39599C-page 325