PIC16LF18854 Datasheet, PDF (614/668 Pages) Microchip Technology – C Compiler Optimized RISC Architecture

PIC16(L)F18856/76
FIGURE 37-5:
CLOCK TIMING
Q4
Q1
CLKIN
OS1
Note 1: See Table 37-7.
Q2
Q3
OS2
OS20
Q4
OS2
TABLE 37-7: EXTERNAL CLOCK/OSCILLATOR TIMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Sym.
ECL Oscillator
Characteristic
Min. Typ† Max. Units
Conditions
OS1
F_ECL
Clock Frequency
—
—
500
kHz
OS2
T_{ECL_DC} Clock Duty Cycle
40
—
60
%
ECM Oscillator
OS3
F_ECM
Clock Frequency
—
—
4
MHz
OS4
T_{ECM_DC} Clock Duty Cycle
40
—
60
%
ECH Oscillator
OS5
F_ECH
Clock Frequency
—
—
32
MHz
OS6
T_{ECH_DC} Clock Duty Cycle
40
—
60
%
LP Oscillator
OS7
F_LP
Clock Frequency
—
—
100
kHz Note 4
XT Oscillator
OS8
F_XT
Clock Frequency
—
—
4
MHz Note 4
HS Oscillator
OS9
F_HS
Clock Frequency
—
—
20
MHz Note 4
System Oscillator
OS20 F_OSC
System Clock Frequency
—
—
32
MHz (Note 2, Note 3)
OS21 F_CY
Instruction Frequency
—
FOSC/4
—
MHz
OS22 T_CY
Instruction Period
125
1/F_CY
—
ns
* These parameters are characterized but not tested.
† Data in “Typ” column is at 3.0V, 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 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.
2: The system clock frequency (FOSC) is selected by the “main clock switch controls” as described in Section 6.0 “Oscil-
lator Module (with Fail-Safe Clock Monitor)”.
3: The system clock frequency (FOSC) must meet the voltage requirements defined in the Section 37.2 “Standard
Operating Conditions”.
4: LP, XT and HS oscillator modes require an appropriate crystal or resonator to be connected to the device. For clocking
the device with the external square wave, one of the EC mode selections must be used.
DS40001824A-page 614
Preliminary
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