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Board Technical Information
A.6
A.7
A.8
A.9
OSCILLATOR OPTIONS
The on-board firmware uses the internal RC oscillator running at 8 MHz.
? Internal RC oscillator running at 8 MHz can be used.
? Pads provided for user-furnished crystal/resonator (Y2) and two capacitors
(C16 and C17).
? Socket provided for a canned oscillator (Y3). This oscillator can be disabled by
removing jumpers, JP9, JP11 and JP12.
? 32.768 kHz (watch-type) crystal for Timer1 (Y1) is always connected to RC0 and
RC1.
RS-232 SERIAL PORT
An RS-232 level shifting IC has been provided with all necessary hardware to support
connection of an RS-232 host through the DB9 connector (PI). The port is configured
as DCE and can be connected to a PC using a serial cable.
REAL-TIME CLOCK
This circuit allows the user to configure a PIC microcontroller for timekeeping using a
32.768 kHz clock crystal connected to Timer1 module’s T1OSO and T1OSI pins.
SERIAL EEPROM
A socket for a Microwire EEPROM is provided on the board to illustrate usage of
the Synchronous mode of operation of the USART module. For its operation:
? Jumpers, JP15 and JP16, should be connected.
? In the jumper, J6, U9-CS should be connected with RB5.
? In the jumper, J13, U9-ORG (pin 6) should be connected to GND.
Note 1:
2:
3:
For the PIC18F85J90 and PIC18F87J90 PIM, the RG2 and RG3 pins are
connected to RC3 and RC4 of U1A, respectively.
For the PIC16F917 PIM, the RD1 and RD2 pins are connected to RC3
and RC4 of U1A, respectively.
For the PIC18F8490, PIC16F946 and PIC16F/LF/1946/7 PIMs, the RC3
and RC4 pins are connected to RC3 and RC4 of U1A, respectively.
A.10 ANALOG INPUT
A 10 k ? potentiometer is connected through a series of 100 ? resistors to AN0. The
potentiometer can be adjusted from V CC to GND. The jumper, J11, should be
connecting the potentiometer to AN0.
? 2010 Microchip Technology Inc.
DS51662C-page 47
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