Chameleon-PIC Nurve Networks, Chameleon-PIC Datasheet - Page 51

• 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

© 2009 NURVE NETWORKS LLC “Exploring the Chameleon PIC 16-Bit”
Figure 11.5 - NTSC composite video waveform.
This figure depicts the portion of the signal that represents one horizontal scan line. Each line is made up of the active
video portion and the horizontal blanking portion. The active video portion contains the picture brightness (luma) and color
(chroma) information. The brightness information is the instantaneous amplitude at any point in time. The unit of measure
for the amplitude is in terms of an IRE unit. IRE is an arbitrary unit where 140 IRE = 1Vp-p (or sometimes 1.4Vp-p). From
the figure, you can see that the voltage during the active video portion would yield a bright-white picture for this horizontal
scan line, whereas the horizontal blanking portion would be displayed as black and therefore not seen on the screen.
Please refer back to Figure 11.3..4 for a pictorial explanation. Some video systems (NTSC only) use something called
"setup," which places reference black a point equal to 7.5 IRE or about 54mV above the blanking level.
Figure 11.6 (a) - NTSC composite video waveform.
Figure 11.6 (a) depicts yet another timing drawing the NTSC video signal, this time, more formally labeled at the RS-170A
color standard created in the early 1950’s as the successor to the B/W only RS-170 standard created 1941.
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