Datasheet

 1996 Microchip Technology Inc. Preliminary DS40122B-page 111
PIC14000
13.4 Timing Diagrams and Specifications
FIGURE 13-1: EXTERNAL CLOCK TIMING
TABLE 13-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Sym Characteristic Min Typ† Max Units Conditions
FOSC External CLKIN Frequency (Note 1) DC
DC
—
—
4
20
MHz
MHz
HS osc mode (PIC14000-04)
HS osc mode (PIC14000-20)
Oscillator Frequency (Note 1) 4
4
—
—
4
20
MHz
MHz
HS osc mode (PIC14000-04)
HS osc mode (PIC14000-20)
1
TOSC External CLKIN Period (Note 1) 250
50
—
—
—
—
ns
ns
HS osc mode (PIC14000-04)
HS osc mode (PIC14000-20)
Oscillator Period (Note 1) 250
50
—
—
250
250
ns
ns
HS osc mode (PIC14000-04)
HS osc mode (PIC14000-20)
2
TCY Instruction Cycle Time (Note 1) 200 — DC ns TCY = 4/FOSC
3
T
OSL,
TOSH
Clock in (OSC1) High or Low Time 10 — — ns HS oscillator
4
T
OSR,
TOSF
Clock in (OSC1) Rise or Fall Time — — 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 pin.
When an external clock input is used, the “Max.” cycle time limit is “DC” (no clock) for all devices.
3
3
4
4
1
2
Q4
Q1 Q2 Q3 Q4
Q1
OSC1
CLKOUT