PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 184

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

PIC17C4X
19.5
FIGURE 19-2: EXTERNAL CLOCK TIMING
TABLE 19-2:
DS30412C-page 184
Applicable Devices 42 R42 42A 43 R43 44
Note 1: Instruction cycle period (T
Param
No.
†
‡
1
2
3
4
† In EC and RC modes only.
OSC2 †
OSC1
Timing Diagrams and Specifications
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.
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.
TosR,
Sym
TosL,
TosH
TosF
Fosc
Tosc
T
CY
EXTERNAL CLOCK TIMING REQUIREMENTS
External CLKIN Frequency
(Note 1)
Oscillator Frequency
(Note 1)
External CLKIN Period
(Note 1)
Oscillator Period
(Note 1)
Instruction Cycle Time
(Note 1)
Clock in (OSC1)
high or low time
Clock in (OSC1)
rise or fall time
Characteristic
Q4
CY
) equals four times the input oscillator time base period. All specified values are based on
Q1
121.2
62.5
30.3
62.5
30.3
10 ‡
Min
125
250
125
500
DC
DC
DC
DC
DC
DC
40
40
—
1
1
1
1
1
4/Fosc
Typ†
Q2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1,000
1,000
1,000
1,000
Max
2
DC
5 ‡
16
25
33
16
25
33
—
—
—
—
—
—
—
8
4
8
2
Units
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
Q3
3
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
EC osc mode - 08 devices (8 MHz devices)
RC osc mode
XT osc mode - 08 devices (8 MHz devices)
LF osc mode
EC osc mode - 08 devices (8 MHz devices)
RC osc mode
XT osc mode - 08 devices (8 MHz devices)
LF osc mode
EC oscillator
EC oscillator
Q4
3
- 16 devices (16 MHz devices)
- 25 devices (25 MHz devices)
- 33 devices (33 MHz devices)
- 16 devices (16 MHz devices)
- 25 devices (25 MHz devices)
- 33 devices (33 MHz devices)
- 16 devices (16 MHz devices)
- 25 devices (25 MHz devices)
- 33 devices (33 MHz devices)
- 16 devices (16 MHz devices)
- 25 devices (25 MHz devices)
- 33 devices (33 MHz devices)
1996 Microchip Technology Inc.
Conditions
4
Q1
4