PIC12F519-I/SN Microchip Technology, PIC12F519-I/SN Datasheet - Page 42

• Manufacturer Part Number: PIC12F519-I/SN
• Description: IC PIC MCU FLASH 1KX12 8SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 12Fr

Specifications of PIC12F519-I/SN

• Program Memory Type: FLASH
• Program Memory Size: 1.5KB (1K x 12)
• Package / Case: 8-SOIC (3.9mm Width)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Ram Size: 41 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC12F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 41 B
• Interface Type: USB
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005
• Minimum Operating Temperature: - 40 C
• Height: 1.25 mm
• Length: 4.9 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Width: 3.9 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC12F519
8.2.3
Either a prepackaged oscillator or a simple oscillator
circuit with TTL gates can be used as an external
crystal oscillator circuit. Prepackaged oscillators provide
a wide operating range and better stability. A
well-designed crystal oscillator will provide good
performance with TTL gates. Two types of crystal
oscillator circuits can be used: one with parallel
resonance, or one with series resonance.
Figure 8-3 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the
fundamental frequency of the crystal. The 74AS04
inverter performs the 180-degree phase shift that a
parallel oscillator requires. The 4.7 kΩ resistor provides
the negative feedback for stability. The 10 kΩ
potentiometers bias the 74AS04 in the linear region.
This circuit could be used for external oscillator designs.
FIGURE 8-3:
Figure 8-4 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverter performs a
180-degree phase shift in a series resonant oscillator
circuit. The 330Ω resistors provide the negative
feedback to bias the inverters in their linear region.
FIGURE 8-4:
DS41319B-page 40
74AS04
330
10k
+5V
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
20 pF
0.1 mF
10k
XTAL
74AS04
XTAL
4.7k
74AS04
330
20 pF
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
10k
74AS04
74AS04
To Other
Devices
To Other
Devices
PIC12F519
CLKIN
PIC12F519
CLKIN
values above 20 pF for noise and stability reasons. With
Section 11.0
information on variation over voltage and temperature).
8.2.4
For timing insensitive applications, the RC circuit option
offers additional cost savings. The RC oscillator
frequency is a function of the supply voltage, the
resistor (R
operating temperature. In addition to this, the oscillator
frequency will vary from unit-to-unit due to normal
process
difference in lead frame capacitance between package
types will also affect the oscillation frequency, especially
for low C
account variation due to tolerance of external R and C
components used.
Figure 8-5 shows how the R/C combination is
connected to the PIC12F519 device. For R
below 3.0 kΩ, the oscillator operation may become
unstable, or stop completely. For very high R
(e.g., 1 MΩ), the oscillator becomes sensitive to noise,
humidity and leakage. It is recommended keeping R
between 5.0 kΩ and 100 kΩ.
Although the oscillator will operate with no external
capacitor (C
no or small external capacitance, the oscillation
frequency can vary dramatically due to changes in
external capacitances, such as PCB trace capacitance
or package lead frame capacitance. See Figure 11-1
and Figure 11-2.
FIGURE 8-5:
8.2.5
The internal RC oscillator provides a fixed 4/8 MHz
(nominal) system clock at V
In addition, a calibration instruction is programmed into
the last address of memory, which contains the
calibration value for the internal RC oscillator. This
location is always non-code protected, regardless of the
code-protect settings. This value is programmed as a
MOVLW XX instruction where XX is the calibration value,
and is placed at the Reset vector. This will load the W
register with the calibration value upon Reset and the
C
V
R
EXT
SS
EXT
V
DD
EXT
EXT
parameter
EXTERNAL RC OSCILLATOR
INTERNAL 4/8 MHz RC
OSCILLATOR
EXT
values. The user also needs to take into
) and capacitor (C
“Electrical
= 0 pF), it is recommended using
EXTERNAL RC
OSCILLATOR MODE
variation.
© 2008 Microchip Technology Inc.
OSC1
N
DD
Characteristics”
= 3.5V and 25°C, (see
EXT
Furthermore,
) values, and the
PIC16F519
EXT
EXT
Internal
clock
values
values
EXT
the
for