PIC16F870_13 Datasheet, PDF (127/172 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

PIC16F870/871
TABLE 14-1: EXTERNAL CLOCK TIMING REQUIREMENTS
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKI Frequency
(Note 1)
DC —
DC —
4 MHz XT and RC Osc mode
4 MHz HS Osc mode (-04)
DC —
20 MHz HS Osc mode (-20)
DC —
200 kHz LP Osc mode
Oscillator Frequency
(Note 1)
DC —
0.1 —
4 MHz RC Osc mode
4 MHz XT Osc mode
4
—
20 MHz HS Osc mode
5
—
200 kHz LP Osc mode
1
TOSC External CLKI Period
(Note 1)
250 —
250 —
—
ns XT and RC Osc mode
—
ns HS Osc mode (-04)
50
—
—
ns HS Osc mode (-20)
5
—
—
s LP Osc mode
Oscillator Period
(Note 1)
250 —
—
ns RC Osc mode
250 — 10,000 ns XT Osc mode
250 —
250 ns HS Osc mode (-04)
50
—
250 ns HS Osc mode (-20)
5
—
—
s LP Osc mode
2
TCY Instruction Cycle Time
(Note 1)
200 TCY
DC
ns TCY = 4/FOSC
3
TosL, External Clock in (OSC1) High 100 —
—
ns XT oscillator
TosH or Low Time
2.5 —
—
s LP oscillator
15
—
—
ns HS oscillator
4
TosR, External Clock in (OSC1) Rise —
—
25
ns XT oscillator
TosF or Fall Time
—
—
50
ns LP oscillator
—
—
15
ns HS oscillator
† 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 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/CLKI pin. When an external clock input is used, the "Max."
cycle time limit is "DC" (no clock) for all devices.
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DS30569C-page 127