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PICDEM 4 User’s Guide
A.5
A.6
A.7
SWITCHES
Three switches provide the following functions:
? S1 - Active low switch connected to RA4
? S2 - MCLR to hard reset the processor
? S3 - Active low switch connected to RB0
Switch S2 has a debounce capacitor, whereas S1 and S3 do not, allowing the user to
investigate debounce techniques.
When pressed, the switches are grounded; when idle, they are pulled high (+5V).
OSCILLATOR OPTIONS
? RC oscillator (2 MHz approximately) supplied. This oscillator may be disabled by
removing jumper J14.
? Pads provided for user furnished crystal/resonator and two capacitors (Y3).
? Socket provided for a canned oscillator (Y1).
? 32.768 kHz (watch type) crystal for Timer1 (Y2). This oscillator can be disabled by
removing jumpers J7 and J9.
ANALOG INPUT
There are four 5 k ? potentiometers (R12, R15, R33, R34) on the PICDEM 4 board.
These are all connected to PORTA (RA0-RA3), and can be adjusted from V SS to V DD
to provide an analog input to the devices with an A/D or Comparator module.
Potentiometers R12, R15, R33, and R34 all have individual jumpers. For a potentiom-
eter to function, its specific jumper must be on. The jumper removed will allow for other
I/O functions to take place. For all of the potentiometers to be functional, these jumpers
must be configured as follows:
?
?
?
?
?
J22 - OFF (PORTA LEDs)
J24 - ON
J25 - ON
If J26 is ON, then J23 is OFF
If J27 is ON, then J28 is OFF
The above conditions will enable all potentiometers.
A.8
ICD CONNECTOR
By way of the modular connector (J5), the MPLAB ICD 2 can be connected for low cost
debugging. The ICD connector utilizes RB6 and RB7 of the microcontroller for in-circuit
debugging. For ICD operation, the Real-time Clock connections to the microcontroller
must be disabled. For ICD operation, these jumpers must be configured as follows:
? J7 - OFF (RTC)
? J9 - OFF (RTC)
? J21 - OFF (PORTB LEDs)
DS51337A-page 12
? 2003 Microchip Technology Inc.
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