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34708 Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc |
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34708 Datasheet(HTML) 83 Page - Freescale Semiconductor, Inc |
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83 / 159 page  Analog Integrated Circuit Device Data 83 Freescale Semiconductor MC34708 Functional Block Description The touch screen readings can be repeated, as in the following example readout sequence, to reduce the interrupt rate and to allow for easier noise rejection. The dummy conversion inserted between the different readings allows the references in the system to be pre-biased for the change in touch screen plate polarity. It will read out as ‘0’. A touchscreen reading will take precedence over an ADC sequence. If an ADC reading is triggered during a touchscreen event, the ADC sequence will be overwritten by the Touchscreen data. The first Touch screen conversion can be delayed from 0 (default) to 600 s by programming the TSDLY1[3:0] bits. The TSDLY2[3:0] controls the delay between each of the touch screen conversions from 0 to 600 s. TSDLY[2:0] sets the delay after the last address is converted. TSDLY1, 2, and 3 are set to 0 by default. To perform a touch screen reading, the processor must do the following: • Enable the touch screen with TSEN • Select the touch screen sequence by programming the TSSEL0-TSSEL7 SPI bits. • Program the TSSTOP[2:0] • Program the delay between the conversion via the TSDLY1 and TSDLY2 settings. • Trigger the ADC via the TSSTART SPI bit • Wait for an interrupt indicating the conversion is done TSDONEI • And then read out the data in the ADRESULTx registers Table 75. Touch Screen Action Select TSSELx[1:0] Signals Sampled 00 Dummy to discharge TSREF cap 01 X plate 10 Y –plate 11 Contact Table 76. TSDLYx[3:0] TSDLYx[3:0] Delay in uS 0000 0 0001 40 0010 80 0011 120 0100 160 0101 200 0110 240 0111 280 1000 320 1001 360 1010 400 1011 440 1100 480 1101 520 1110 560 1111 600 |
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