PIC18F23K20 Datasheet, PDF (377/420 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2XK20/4XK20
26.11.3 TIMING DIAGRAMS AND SPECIFICATIONS
FIGURE 26-4:
EXTERNAL CLOCK TIMING (ALL MODES EXCEPT PLL)
Q4
Q1
Q2
Q3
Q4
Q1
OSC1
CLKOUT
1
3
3
4
4
2
TABLE 26-6: EXTERNAL CLOCK TIMING REQUIREMENTS
Param.
No.
Symbol
Characteristic
Min
Max Units
Conditions
1A
1
2
3
4
Note 1:
FOSC
External CLKIN
Frequency⁽¹⁾
Oscillator Frequency⁽¹⁾
DC
64
MHz EC, ECIO Oscillator mode
DC
4
MHz RC Oscillator mode
0.1
4
MHz XT Oscillator mode
4
25
MHz HS Oscillator mode
4
16
MHz HS + PLL Oscillator mode
TOSC
External CLKIN Period⁽¹⁾
Oscillator Period⁽¹⁾
5
15.6
250
33
kHz LP Oscillator mode
—
ns EC, ECIO Oscillator mode
—
ns RC Oscillator mode
250
10,000 ns XT Oscillator mode
40
250
ns HS Oscillator mode
62.5
250
ns HS + PLL Oscillator mode
30
TCY
Instruction Cycle Time⁽¹⁾
100
—
μs LP Oscillator mode
—
ns TCY = 4/FOSC
TOSL, External Clock in (OSC1)
30
TOSH
High or Low Time
2.5
—
ns XT Oscillator mode
—
μs LP Oscillator mode
10
—
ns HS Oscillator mode
TOSR, External Clock in (OSC1)
—
TOSF
Rise or Fall Time
—
20
ns XT Oscillator mode
50
ns LP Oscillator mode
—
7.5
ns HS Oscillator mode
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/CLKIN pin. When an external clock
input is used, the “max.” cycle time limit is “DC” (no clock) for all devices.
© 2007 Microchip Technology Inc.
Advance Information
DS41303B-page 375