PIC16F628-20P Datasheet, PDF (138/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

PIC16F62X
TABLE 17-4: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Sym
Characteristic
Min Typ† Max
Fosc External CLKIN Frequency⁽¹⁾
DC
—
4
DC
—
20
DC
—
200
Units
Conditions
MHz XT and ER Osc mode,
VDD = 5.0V
MHz HS Osc mode
kHz LP Osc mode
Oscillator Frequency⁽¹⁾
—
4 MHz ER Osc mode, VDD = 5.0V
0.1
—
4 MHz XT Osc mode
1
—
20 MHz HS Osc mode
—
200 kHz LP Osc mode
3.65
4
4.28 MHz INTRC mode (fast), VDD = 5.0V
37
kHz INTRC mode (slow)
4 INTRC Internal Calibrated RC
3.65 4.00 4.28 MHz VDD = 5.0V
5
ER External Biased ER Frequency 10 kHz
8 MHz
VDD = 5.0V
1
Tosc External CLKIN Period⁽¹⁾
250
—
—
ns XT and ER Osc mode
50
—
—
ns HS Osc mode
5
—
— µs LP Osc mode
Oscillator Period⁽¹⁾
250
—
250
—
50
—
5
250
27
2
Tcy Instruction Cycle Time
1.0
TCY
3 TosL, External CLKIN (OSC1) High 100 * —
TosH External CLKIN Low
* These parameters are characterized but not tested.
—
10,000
1,000
DC
—
ns ER Osc mode
ns XT Osc mode
ns HS Osc mode
µs LP Osc mode
ns INTRC mode (fast)
µs INTRC mode (slow)
ns TCY = 4/FOSC
ns XT oscillator, TOSC L/H duty
cycle*
† 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
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.
DS40300C-page 136
Preliminary
 2003 Microchip Technology Inc.