PIC16F676-I Datasheet, PDF (96/132 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F630/676
12.9 AC CHARACTERISTICS: PIC16F630/676 (INDUSTRIAL, EXTENDED)
FIGURE 12-5:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
OSC1
CLKOUT
1
3
3
4
4
2
TABLE 12-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKIN Frequency⁽¹⁾ DC —
37 kHz LP Osc mode
DC —
4 MHz XT mode
DC —
20 MHz HS mode
DC —
20 MHz EC mode
Oscillator Frequency⁽¹⁾
5
—
—
4
37 kHz LP Osc mode
— MHz INTOSC mode
DC —
4 MHz RC Osc mode
0.1 —
4 MHz XT Osc mode
1
—
20 MHz HS Osc mode
1
TOSC External CLKIN Period⁽¹⁾
27 —

s LP Osc mode
50 —

ns HS Osc mode
50 —

ns EC Osc mode
250 —

ns XT Osc mode
Oscillator Period⁽¹⁾
27
200 s LP Osc mode
— 250
—
ns INTOSC mode
250 —
—
ns RC Osc mode
250 — 10,000 ns XT Osc mode
50 — 1,000 ns HS Osc mode
2
TCY _{Instruction Cycle Time}⁽¹⁾
200 TCY
DC
ns TCY = 4/FOSC
3 TosL, External CLKIN (OSC1) High 2* —
TosH External CLKIN Low
20* —
—
s 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 CLKIN Rise
TosF External CLKIN 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.
DS40039F-page 96
 2010 Microchip Technology Inc.