DM163010 Microchip Technology, DM163010 Datasheet - Page 35

• 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

©
3.1
OSC2
OSC1
2001 Microchip Technology Inc.
Oscillator Support
3.1.1
3.1.2
Chapter 3. PICDEM™ USB Hardware
EC
E4
HS
H4
The PIC16C745/765 can support a few different oscillator options. Regard-
less of what oscillator is used, the internal clock must be 24 MHz. This is
required by the USB Serial Interface Engine (SIE). To assist in running at
24 MHz with a low cost oscillator, the HS and EC clock modes are provided
with an internal 4x PLL clock multiplier. This allows 6 MHz oscillators to be
used to save cost and EMI. The PICDEM™ USB hardware has the provisions
for a canned oscillator, a crystal, or resonators. Refer to Figure 3.1.
Canned Oscillator
Any full size canned oscillator of 6 MHz or 24 MHz can be used. Remove the
resonator from the resonator pads to use the oscillator.
Resonator
A 6 MHz or 24 MHz resonator can be used. Pads are available to use resona-
tors with internal or external capacitors. The resonator supplied with the kit is
a 6 MHz resonator with internal capacitors. If you decide to use a resonator
with external capacitors, you should select capacitors that will maximize the
voltage swing across the resonator.
Figure 3.1: Oscillator/PLL Clock Control
4x PLL
PICDEM™ USB User’s Guide
EC
HS
E4
H4
24 MHz
F
INT
Generator
Q Clock
6 MHz
DS41174A-page 31
To PIC
To SIE