Digilent 6021-210-000P-KIT - Manual (Page 13)

Universal Development Board™ Reference Manual
Copyright Digilent, Inc. All rights reserved.
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Page 13 of 27
6.3.3 IC3_GS Program Jumper Settings
The following diagram illustrates the settings for the program jumpers when using PIC24 GS family devices in DIP
socket IC3.
IC2
IC3
IC3_GS
IC4
J6 J7
IC
2
IC
3
/4
JP8
PROG JUMPERS
M
C
L
R
6.3.4 IC4 Program Jumper Settings
The following diagram illustrates the settings for the program jumpers when using PIC16/PIC18 devices in DIP
socket IC4.
IC2
IC3
IC3_GS
IC4
J6 J7
IC
2
IC
3
/4
JP8
PROG JUMPERS
M
C
L
R
7 Oscillator Options
The UDB board has provision for two oscillators: an 8-pin DIP socket, IC6, for a socketed high frequency oscillator,
and an unload footprint, IC1, for a surface mounted 32.768KKHz low frequency oscillator.
7.1 High Frequency Oscillator
Oscillator socket IC6, labeled CLKIN on the board, is used to provide a high frequency clock source for the
processor clock for use with any of the DIP sockets, the PIM socket, or the on-board PIC32MX360. As shipped from
the factory, IC6 is loaded with an Epson SG8002 programmable CMOS oscillator. The oscillator shipped with the
board will be programmed to operate at 8MMHz. The SG8002 is a one-time programmable device that can be
programmed for any frequency in the range 1MHz to 120MHz. If an oscillator frequency other than 8MHz is
desired, an SG8002 programmed to the desired frequency can be obtained and installed in the IC6 socket. An
SG8002 programmed to the desired operating frequency can be obtained from a number of electronics
distributors, such as Digikey® or Mouser. The SG8002 is available in both 5V and 3.3V versions. Ensure that a 3.3V
device is obtained when purchasing a new oscillator.
The output of the IC6 oscillator, called CLKIN in the schematic, is hard wired to the OSC1/CLKI/RC12 position on the
PIM socket and the on-board PIC32 microcontroller. This makes the oscillator output available as an external clock
source for either the microcontroller on a PIM or the on-board PIC32MX360. The CLKIN signal can be routed to the
appropriate DIP socket by installing a shorting block in the appropriate position on clock select jumper JP7.
The CLKIN signal is also available on pin 3 of header J7. Pin3 of J7 can be used to monitor the clock signal for
troubleshooting purposes, or using a jumper wire, the clock signal can be routed to other positions on the board.