PIC16F819-I/SSTSL Microchip Technology, PIC16F819-I/SSTSL Datasheet - Page 35

• Manufacturer Part Number: PIC16F819-I/SSTSL
• Description: IC PIC MCU FLASH 2KX14 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F819-I/SSTSL

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
4.1
The PIC16F818/819 can be operated in eight different
oscillator modes. The user can program three configu-
ration bits (FOSC2:FOSC0) to select one of these eight
modes (modes 5-8 are new PIC16 oscillator
configurations):
1.
2.
3.
4.
5.
6.
7.
8.
4.2
In XT, LP or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKI and OSC2/CLKO pins
to establish oscillation (see Figure 4-1 and Figure 4-2).
The PIC16F818/819 oscillator design requires the use
of a parallel cut crystal. Use of a series cut crystal may
give a frequency out of the crystal manufacturer’s
specifications.
FIGURE 4-1:
 2004 Microchip Technology Inc.
Note 1: See Table 4-1 for typical values of C1 and C2.
LP
XT
HS
RC
RCIO
INTIO1
INTIO2
ECIO
2: A series resistor (R
3: R
C1
C2
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
(1)
(1)
strip cut crystals.
between 2 M
F
varies with the crystal chosen (typically
R
XTAL
Low-Power Crystal
Crystal/Resonator
High-Speed Crystal/Resonator
External Resistor/Capacitor with
F
External Resistor/Capacitor with
I/O on RA6
Internal Oscillator with F
output on RA6 and I/O on RA7
Internal Oscillator with I/O on RA6
and RA7
External Clock with I/O on RA6
S (2)
OSC
OSC1
OSC2
/4 output on RA6
CRYSTAL OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
to 10 M
S
R
) may be required for AT
F
(3)
.
PIC16F818/819
OSC
To Internal
Logic
Sleep
/4
TABLE 4-1:
Capacitor values are for design guidance only.
These capacitors were tested with the crystals listed
below for basic start-up and operation. These values
were not optimized.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
See the notes following this table for additional
information.
Osc Type
DD
Note 1: Higher capacitance increases the stability
HS
LP
XT
and temperature range for the application.
2: Since each crystal has its own character-
3: R
4: Always verify oscillator performance over
of the oscillator but also increases the
start-up time.
istics, the user should consult the crystal
manufacturer for appropriate values of
external components.
as XT mode, to avoid overdriving crystals
with low drive level specification.
the V
expected for the application.
S
200 kHz
200 kHz
20 MHz
Crystal
32 kHz
PIC16F818/819
1 MHz
4 MHz
4 MHz
8 MHz
may be required in HS mode, as well
Freq
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR (FOR
DESIGN GUIDANCE ONLY)
DD
and temperature range that is
Typical Capacitor Values
33 pF
15 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C1
Tested:
DS39598E-page 33
33 pF
15 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C2