Datasheet

PIC16F7X
DS30325B-page 126  2002 Microchip Technology Inc.
FIGURE 15-4: EXTERNAL CLOCK TIMING
OSC1
CLKOUT
Q4 Q1 Q2 Q3 Q4 Q1
1
2
3
3
4
4
TABLE 15-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Symbol Characteristic Min Typ† Max Units Conditions
F
OSC External CLKIN Frequency
(Note 1)
DC — 1 MHz XT osc mode
DC — 20 MHz HS osc mode
DC — 32 kHz LP osc mode
Oscillator Frequency
(Note 1)
DC — 4 MHz RC osc mode
0.1 — 4 MHz XT osc mode
4
5
—
—
20
200
MHz
kHz
HS osc mode
LP osc mode
1
TOSC External CLKIN Period
(Note 1)
1000 ——ns XT osc mode
50 ——ns HS osc mode
5 ——ms LP osc mode
Oscillator Period
(Note 1)
250 ——ns RC osc mode
250 — 10,000 ns XT osc mode
50 — 250 ns HS osc mode
5 ——ms LP osc mode
2
TCY Instruction Cycle Time
(Note 1)
200 TCY DC ns TCY = 4/FOSC
3
TosL,
TosH
External Clock in (OSC1)
High or Low Time
500 ——ns XT oscillator
2.5 ——ms LP oscillator
15 ——ns HS oscillator
4
TosR,
TosF
External Clock in (OSC1)
Rise or Fall Time
— — 25 ns XT oscillator
— — 50 ns LP oscillator
—— 15 ns HS oscillator
† 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 (T
CY) 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.