PIC18F2550T-I/SO Microchip Technology, PIC18F2550T-I/SO Datasheet - Page 27

• Manufacturer Part Number: PIC18F2550T-I/SO
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2550T-I/SO

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SPI, I2C, EAUSART
• Maximum Clock Frequency: 48 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DM163025, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 10 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: I3-DB18F4550 - BOARD DAUGHTER ICEPIC3DM163025 - PIC DEM FULL SPEED USB DEMO BRD
• Lead Free Status / Rohs Status: Details

2.2.2
In HS, HSPLL, XT and XTPLL Oscillator modes, a
crystal or ceramic resonator is connected to the OSC1
and OSC2 pins to establish oscillation. Figure 2-2
shows the pin connections.
The oscillator design requires the use of a parallel cut
crystal.
FIGURE 2-2:
© 2009 Microchip Technology Inc.
Note 1: See Table 2-1 and Table 2-2 for initial values of
Note:
C1
C2
2: A series resistor (R
3: R
(1)
(1)
C1 and C2.
strip cut crystals.
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
Use of a series cut crystal may give a fre-
quency out of the crystal manufacturer’s
specifications.
F
varies with the oscillator mode chosen.
XTAL
R
S
(2)
OSC2
OSC1
CRYSTAL/CERAMIC
RESONATOR OPERATION
(XT, HS OR HSPLL
CONFIGURATION)
S
) may be required for AT
R
F
(3)
PIC18FXXXX
Sleep
PIC18F2455/2550/4455/4550
To
Internal
Logic
TABLE 2-1:
Capacitor values are for design guidance only.
These capacitors were tested with the resonators
listed below for basic start-up and operation. These
values are 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 Table 2-2 for additional
information.
When using ceramic resonators with frequencies
above 3.5 MHz, HS mode is recommended over XT
mode. HS mode may be used at any V
the controller is rated. If HS is selected, the gain of the
oscillator may overdrive the resonator. Therefore, a
series resistor should be placed between the OSC2
pin and the resonator. As a good starting point, the
recommended value of RS is 330 Ω.
DD
Mode
HS
XT
and temperature range for the application.
Typical Capacitor Values Used:
16.0 MHz
4.0 MHz
8.0 MHz
Freq
Resonators Used:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
16.0 MHz
4.0 MHz
8.0 MHz
OSC1
33 pF
27 pF
22 pF
DS39632E-page 25
DD
for which
OSC2
33 pF
27 pF
22 pF