PIC16C925_13 Datasheet, PDF (147/180 Pages) Microchip Technology – 64/68-Pin CMOS Microcontrollers with LCD Driver

PIC16C925/926
15.4 Timing Diagrams and Specifications
FIGURE 15-5:
EXTERNAL CLOCK TIMING
Q4
Q1
Q2
Q3
OSC1
CLKOUT
1
3
3
2
Q4
Q1
4
4
TABLE 15-3: EXTERNAL CLOCK TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
FOSC External CLKIN Frequency
(Note 1)
DC —
DC —
DC —
4 MHz XT and RC osc mode
20 MHz HS osc mode
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 CLKIN Period
250 —
—
ns XT and RC osc mode
(Note 1)
125 —
—
ns HS osc mode
5
—
—
s LP osc mode
Oscillator Period
(Note 1)
250 —
—
ns RC osc mode
250 — 10,000 ns XT osc mode
125 —
250 ns HS osc mode
5
—
—
s LP osc mode
2
TCY Instruction Cycle Time (Note 1) 500 —
DC
ns TCY = 4/FOSC
3
TosL, External Clock in (OSC1) High or 50 —
—
ns XT oscillator
TosH Low Time
2.5 —
—
s LP oscillator
10 —
—
ns HS oscillator
4
TosR, External Clock in (OSC1) Rise or — —
25
ns XT oscillator
TosF Fall Time
——
50
ns LP oscillator
——
15
ns HS oscillator
† Data in “Typ” column is at 5 V, 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 the OSC1/CLKIN pin.
When an external clock input is used, the “Max.” cycle time limit is “DC” (no clock) for all devices.
 2001-2013 Microchip Technology Inc.
Preliminary
DS39544B-page 147