PIC17C7XX Datasheet, PDF (247/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
20.5 Timing Diagrams and Specifications
FIGURE 20-2: EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
OSC1
1
3
2
Q4
Q1
3
4
4
OSC2 †
† In EC and RC modes only.
TABLE 20-2: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No. Sym
Characteristic
Min Typ† Max Units
Conditions
1
2
3
4
†
‡
Note 1:
Fosc
External CLKIN Fre-
quency
(Note 1)
DC
—
DC
—
DC
—
8 MHz EC osc mode - 08 devices (8 MHz devices)
16 MHz
- 16 devices (16 MHz devices)
33 MHz
- 33 devices (33 MHz devices)
Oscillator Frequency
(Note 1)
DC
—
2
—
2
—
2
—
DC
—
4 MHz RC osc mode
8 MHz XT osc mode - 08 devices (8 MHz devices)
16 MHz
- 16 devices (16 MHz devices)
33 MHz
- 33 devices (33 MHz devices)
2 MHz LF osc mode
Tosc External CLKIN Period
(Note 1)
125
—
62.5 —
30.3 —
—
ns EC osc mode - 08 devices (8 MHz devices)
—
ns
- 16 devices (16 MHz devices)
—
ns
- 33 devices (33 MHz devices)
Oscillator Period
(Note 1)
250
—
—
ns RC osc mode
125
— 1,000 ns XT osc mode - 08 devices (8 MHz devices)
62.5 — 1,000 ns
- 16 devices (16 MHz devices)
30.3 — 1,000 ns
- 33 devices (33 MHz devices)
500
—
—
ns LF osc mode
TCY Instruction Cycle Time
121.2 4/Fosc DC
ns
(Note 1)
TosL, Clock in (OSC1)
TosH high or low time
10 ‡ —
—
ns EC oscillator
TosR, Clock in (OSC1)
TosF rise or fall time
—
—
5‡
ns EC oscillator
Data in “Typ” column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not
tested.
These parameters are for design guidance only and are not tested, nor characterized.
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 con-
sumption. 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.
© 1998 Microchip Technology Inc.
Preliminary
DS30289A-page 247