PIC16F946 Datasheet, PDF (241/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
19.6 AC Characteristics: PIC16F946 (Industrial, Extended)
FIGURE 19-3:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
OSC1
CLKO
1
3
3
4
4
2
TABLE 19-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C ≤ TA ≤ +125°C
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKI Frequency⁽¹⁾ DC —
37 kHz LP Oscillator mode
DC —
4 MHz XT Oscillator mode
DC —
20 MHz HS Oscillator mode
Oscillator Frequency⁽¹⁾
DC —
5
—
20 MHz EC Oscillator mode
37 kHz LP Oscillator mode
—
4
— MHz INTOSC mode
DC —
4 MHz RC Oscillator mode
0.1 —
4 MHz XT Oscillator mode
1
TOSC External CLKI Period⁽¹⁾
1
—
27 —
50 —
20 MHz HS Oscillator mode
∞
μs LP Oscillator mode
∞
Ns HS Oscillator mode
50 —
∞
ns EC Oscillator mode
Oscillator Period⁽¹⁾
250 —
27
∞
ns XT Oscillator mode
200 μs LP Oscillator mode
— 250
—
ns INTOSC mode
250 —
—
ns RC Oscillator mode
250 — 10,000 ns XT Oscillator mode
2
TCY Instruction Cycle Time⁽¹⁾
50 —
200 TCY
1,000
DC
ns HS Oscillator mode
ns TCY = 4/FOSC
3 TosL, External CLKI (OSC1) High 2* —
TosH External CLKI Low
20* —
—
μs LP oscillator, TOSC L/H duty cycle
—
ns HS oscillator, TOSC L/H duty cycle
100 * —
—
ns XT oscillator, TOSC L/H duty cycle
4 TosR, External CLKI Rise
TosF External CLKI Fall
——
——
50* ns LP oscillator
25* ns XT oscillator
——
15* ns HS oscillator
* These parameters are characterized but not tested.
† Data in ‘Typ’ column is at 5V, 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 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 consumption. All devices are tested to operate at ‘min’
values with an external clock applied to OSC1 pin. When an external clock input is used, the ‘max’ cycle
time limit is ‘DC’ (no clock) for all devices.
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 239