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Configuration MC132x Users Manual Rev. 0.23

6.5.4 Address of the last pixel of a line

the rightmost pixel. The value is the pixel address divided by ten.

Command: :r5<x

> <x

> ... Range 000h ...07fh

Response: ACK if enabled by separate command :A<n>

Example: :r505f = 95 (dec) * 10 Ö line end at pixel 790 (dec)

Calculation of the value of r5: Value of r5 = Pixel-Nr./10

Calculation of horizontal size: (r5 – r4 + 1) * 10

e.g.: r4 = 010, r5=04f (95 - 32 + 1) * 10 = 640 pixel per line

The difference r5 - r4 must be in the range: 0 ≤ r5-r4 ≤ 7fh .

6.5.5 Tracking

For rapid window movement even at slow baud rates a short command is provided..

command: :t<n>,<m>

<m> = X-position in pixel/10,

range 00h ...07fh

<n> = Y-position in lines / 4,

range 00h ...0ffh

Response: ACK if enabled by separate command :A<n>

6.6 Clock selection

The MC132x is equipped with a 2-channel programmable clock synthesizer. One channel controls clock

frequency of the sensor (sensorclock, F

sens

), the other controls the frequency of the pixel clock (pixel-

clock, F

pix

). These independent clocks allow an always optimal ratio depending on the product of

(image size x image frequency) and the data rate on the output.

As the sensor outputs 10 pixel per clock a sensor clock of 6.6MHz could be chosen. Because the sensor

can run up to a clock frequency of 66 MHz only 1/10 of the sensors possible speed would be used. To

make use of the maximum sensor clock and maintaining the maximum data rate on the output, just 120

(1280/10 rounded to steps of 10) from the possible 1280 pixel per line can be selected.

Therefore the ratio of F

sens

and F

pix

depends on the selected line length:

sens

<= (F

pix

• 1280) / (5 • line length)

or if 100 pixel line length is chosen:

sens

= (33 • 1280) / (5 • 100) = 70,4 MHz

As this exceeds the maximum sensor clock frequency, F

sens

is chosen as 66 MHz and F

pix

as 33 MHz.

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