PIC16F627A_05 Datasheet, PDF (146/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
17.6 Timing Diagrams and Specifications
FIGURE 17-4:
EXTERNAL CLOCK TIMING
Q4
OSC1
CLKOUT
Q1
Q2
Q3
1
3
3
2
Q4
Q1
4
4
TABLE 17-4: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKIN Frequency⁽¹⁾ DC
—
4 MHz XT and RC Osc mode,
VDD = 5.0 V
Oscillator Frequency⁽¹⁾
DC
—
20 MHz HS, EC Osc mode
DC
—
200 kHz LP Osc mode
—
—
4 MHz RC Osc mode, VDD = 5.0V
0.1
—
4 MHz XT Osc mode
1
—
20 MHz HS Osc mode
—
—
200 kHz LP Osc mode
1
TOSC External CLKIN Period⁽¹⁾
Oscillator Period⁽¹⁾
—
4
—
48
250
—
50
—
5
—
250
—
— MHz INTOSC mode (fast)
— kHz INTOSC mode (slow)
— ns XT and RC Osc mode
— ns HS, EC Osc mode
— μs LP Osc mode
— ns RC Osc mode
250
— 10,000 ns XT Osc mode
50
— 1,000 ns HS Osc mode
5
—
— μs LP Osc mode
—
250
—
ns INTOSC mode (fast)
—
21
— μs INTOSC mode (slow)
2
TCY Instruction Cycle Time
200
TCY
DC
ns TCY = 4/FOSC
3
TosL, External CLKIN (OSC1) High 100* —
—
ns XT oscillator, TOSC L/H duty
TosH External CLKIN Low
cycle
4
RC External Biased RC
Frequency
10 kHz* — 4 MHz — VDD = 5.0V
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1:
Instruction cycle period (TCY) equals four times the input oscillator time-based 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 oper-
ation 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.
DS40044D-page 144
© 2005 Microchip Technology Inc.