PIC16F7X
FIGURE 15-4:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
4
Q1
OSC1
1
3
4
3
2
CLKOUT
TABLE 15-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
Symbol
Characteristic
Min Typ†
Max
Units
Conditions
No.
FOSC
External CLKIN Frequency
(Note 1)
DC
DC
DC
DC
0.1
—
—
—
—
—
1
20
32
4
MHz XT osc mode
MHz HS osc mode
kHz LP osc mode
MHz RC osc mode
MHz XT osc mode
Oscillator Frequency
(Note 1)
4
4
5
—
—
20
200
MHz HS osc mode
kHz LP osc mode
1
TOSC
External CLKIN Period
(Note 1)
1000
50
—
—
—
—
ns XT osc mode
ns HS osc mode
ms LP osc mode
ns RC osc mode
ns XT osc mode
ns HS osc mode
ms LP osc mode
ns TCY = 4/FOSC
5
—
—
Oscillator Period
(Note 1)
250
250
50
—
—
—
10,000
250
—
—
5
—
2
3
TCY
Instruction Cycle Time
(Note 1)
200
TCY
DC
TosL,
TosH
External Clock in (OSC1)
High or Low Time
500
2.5
15
—
—
—
—
—
—
—
—
—
—
25
50
15
ns XT oscillator
ms LP oscillator
ns HS oscillator
ns XT oscillator
ns LP oscillator
ns HS oscillator
4
TosR,
TosF
External Clock in (OSC1)
Rise or Fall Time
—
—
†
Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: Instruction cycle period (TCY) equals four times the input oscillator time-base period. 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.
DS30325B-page 126
2002 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
