PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 155

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

17.4
FIGURE 17-2: EXTERNAL CLOCK TIMING
TABLE 17-2:
Note 1: Instruction cycle period (T
Parameter
1996 Microchip Technology Inc.
†
‡
No.
† In EC and RC modes only.
1
2
3
4
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 unstable oscillator operation and/or higher than expected current consump-
tion. 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.
TosR,
Sym
TosL,
TosH
Fosc
TosF
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
Q4
Characteristic
CY
) equals four times the input oscillator time-base period. All specified values are based on
Q1
1
Q2
62.5
62.5
10 ‡
Min
250
500
160
DC
DC
DC
DC
40
40
—
1
1
2
4/Fosc
Typ†
Applicable Devices 42 R42 42A 43 R43 44
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3
Q3
1,000
1,000
3
Max
DC
5 ‡
16
25
16
25
—
—
—
—
—
4
2
4
Units
MHz
MHz
MHz
MHz
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
Q4
EC osc mode - PIC17C42-16
RC osc mode
XT osc mode - PIC17C42-16
LF osc mode
EC osc mode - PIC17C42-16
RC osc mode
XT osc mode - PIC17C42-16
LF osc mode
EC oscillator
EC oscillator
PIC17C4X
4
Conditions
DS30412C-page 155
Q1
- PIC17C42-25
- PIC17C42-25
- PIC17C42-25
- PIC17C42-25