DM163010 Microchip Technology, DM163010 Datasheet - Page 36

• Manufacturer Part Number: DM163010
• Description: BOARD DEMO PICDEM USB
• Manufacturer: Microchip Technology

Specifications of DM163010

• Processor To Be Evaluated: PlC16C745/765
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICDEM™ USB User’s Guide
3.2
DS41174A-page 32
Connector Pinout
3.1.3
3.2.1
Crystal
A fundamental cut crystal of 6 MHz or 24 MHz can be used with additional
capacitors installed in the pads provided. The selection of external capacitors
must be chosen to maximize the voltage across the crystal.
This board was designed to provide experience with LS HID USB code. To
accommodate this goal, two popular interfaces have been selected to allow
for HID experimentation, the PS/2 and Gameport. A serial port was added,
but it cannot be used at baud rates below 4800 due to the high clock speed.
This prevents serial mice from being used. Additional support for LCD and
keypad was added to allow for the support of other popular devices.
Gameport (J4) Pinouts
The PC gameport is typically read through a one-shot multi-vibrator. This con-
figuration uses capacitor charge timing to determine the joystick position. The
implementation for the PICDEM™ USB uses the analog converters to accom-
plish the same task. A 50K resistor is used to pull down each analog channel,
allowing the ADC to read voltages between 1.25V and 5V. This is not full
range, but it will allow joystick functions to work. Removing the pull-down
resistors will allow the full 5V range of the ADC to be used. Each button input
is pulled to 5V through a 1K resistor. Consult the schematic for additional
details.
D-sub female
Figure 3.2: Gameport Pinouts (J4)
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1
D-sub male
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15
©
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2001 Microchip Technology Inc.