Chameleon-PIC Nurve Networks, Chameleon-PIC Datasheet - Page 48

• Manufacturer Part Number: Chameleon-PIC
• Description: MCU, MPU & DSP Development Tools PIC24 & PROPELLER DEV SYSTEM (SBC)
• Manufacturer: Nurve Networks

Specifications of Chameleon-PIC

• Processor To Be Evaluated: PIC24
• Data Bus Width: 16 bit
• Interface Type: USB, VGA, PS/2, I2C, ISP, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

converted to the other before any common processing could be done. Interlaced scanning is where each picture, referred
to as a frame, is divided into two separate sub-pictures, referred to as fields.
Two fields make up a single frame. An interlaced picture is painted on the screen in two passes, by first scanning the
horizontal lines of the first field and then retracing to the top of the screen and then scanning the horizontal lines for the
second field in-between the first set. Field 1 consists of lines 1 through 262 1/2, and field 2 consists of lines 262 1/2
through 525. The interlaced principle is illustrated in Figure 11.3. Only a few lines at the top and the bottom of each field
are shown.
A progressive, or non-interlaced, picture is painted on the screen by scanning all of the horizontal lines of the picture in
one pass from the top to the bottom. This is illustrated in Figure 11.4.
NOTE
Most computer displays that output to TVs are progressive scans, that is, they draw a
single frame 60 times a second without interlacing. However, some computers and
game systems do put out interlaced video. The old Amiga computer was one such
example that had an interlaced video mode option to double the number of scanlines.
Figure 11.3 - Interlaced scanning system.
© 2009 NURVE NETWORKS LLC “Exploring the Chameleon PIC 16-Bit”
48