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PICDEM-1 User’s Guide
A.5
A.6
A.7
A.8
Switches
Three switches provide the following functions:
? S1 – Real-Time Clock/Counter (RTCC), or Timer0, input
? S2 – MCLR to hard reset the processor
? S3 – Active low switch connected to RA1
Switches S1 and S2 have debounce capacitors whereas S3 does not,
allowing the user to investigate key 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 J3.
? Pads provided for user furnished crystal and two capacitors.
? Socket provided for clock oscillator.
Analog Input
A 5K ohm potentiometer is connected through a series 470 ohm resistor to
AN0.
The pot can be adjusted from V DD to GND to provide an analog input to the
parts with an A/D module. Parts without A/D will read a digital high or low
depending upon the position of the potentiometer.
Sample Devices
A sample part programmed with a simple program is included.
Table A.1 lists the I/O features and port connections for each processor type.
Table: A.1 PORT CONNECTIONS
Processor
PIC16C5X,
LEDs
PORTB
RS-232
TX/RX (1)
RA2/RA3
S1
RTCC
T0CKI
S2
MCLR
S3
RA1
CH0 POT
R2 (2)
RA0
PIC16C7XX,
PIC16X8X
PIC17C4X
PORTB
RA2/RA3
T0CKI
MCLR
NC (3)
NC (3)
Note 1: USART module available only on PIC17C4X devices.
2: A/D module available only on PIC16C7XX devices.
3: NC: No connection
DS33015C-page 46
? 1999 Microchip Technology Inc.
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