PIC18C242/JW Microchip Technology, PIC18C242/JW Datasheet - Page 19

• Manufacturer Part Number: PIC18C242/JW
• Description: IC MCU EPROM 8KX16 A/D 28CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C242/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: EPROM, UV
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-CDIP (0.300", 7.62mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

2.0
2.1
The PIC18CXX2 can be operated in eight different
oscillator modes. The user can program three configu-
ration bits (FOSC2, FOSC1, and FOSC0) to select one
of these eight modes:
1.
2.
3.
4.
5.
6.
7.
8.
2.2
In XT, LP, HS or HS-PLL oscillator modes, a crystal or
ceramic resonator is connected to the OSC1 and
OSC2 pins to establish oscillation. Figure 2-1 shows
the pin connections.
The PIC18CXX2 oscillator design requires the use of a
parallel cut crystal.
FIGURE 2-1:
Note:
2001 Microchip Technology Inc.
LP
XT
HS
HS + PLL
RC
RCIO
EC
ECIO
Note 1: See Table 2-1 and Table 2-2 for recom-
C1
C2
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
(1)
(1)
2: A series resistor (R
3: R
Use of a series cut crystal may give a fre-
quency out of the crystal manufacturers
specifications.
mended values of C1 and C2.
XTAL
strip cut crystals.
R
S
F
(2)
varies with the osc mode chosen.
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
High Speed Crystal/Resonator
with x 4 PLL enabled
External Resistor/Capacitor
External Resistor/Capacitor with
External Clock
External Clock with RA6 I/O pin
enabled
RA6 I/O pin enabled
OSC2
OSC1
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
R
S
) may be required for AT
F
(3)
SLEEP
PIC18CXXX
To
Internal
Logic
TABLE 2-1:
These values are for design guidance only.
See notes following this table.
All resonators used did not have built-in capacitors.
16.0 MHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
Mode
Note 1: Higher capacitance increases the stability
HS
XT
2: When operating below 3V V
3: Since each resonator/crystal has its own
of the oscillator, but also increases the
start-up time.
Panasonic EFO-A455K04B
necessary to use high gain HS mode on
lower frequency ceramic resonators.
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate values of external compo-
nents or verify oscillator performance.
Murata Erie CSA16.00MX
16.0 MHz
Murata Erie CSA2.00MG
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
Freq
Resonators Used:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
Ranges Tested:
PIC18CXX2
68 - 100 pF
15 - 68 pF
15 - 68 pF
10 - 68 pF
10 - 22 pF
C1
DS39026C-page 17
DD
68 - 100 pF
15 - 68 pF
15 - 68 pF
10 - 68 pF
10 - 22 pF
, it may be
0.3%
0.5%
0.5%
0.5%
0.5%
C2