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7906 Datasheet(PDF) 318 Page - Renesas Technology Corp

Part # 7906
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  531 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7906 Datasheet(HTML) 318 Page - Renesas Technology Corp

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A-D CONVERTER
7906 Group User’s Manual Rev.2.0
12-23
Fig. 12.8.2 Initial setting example for related registers in repeat mode (2)
12.8 Repeat mode
Operation starts.
Trigger generated
Setting of A-D conversion start bit to “1.”
b7
b0
A-D control register 0
(Address 1E16)
A-D conversion start bit
1
Port P7 direction register
b7
b0
Port P7 direction register
(Address 1116)
Clear the bits, corresponding to
the selected analog input pins,
to “0.”
AN0
AN1
AN2
AN3
AN4
Continued from preceding Figure 12.8.1
Note: Writing to the following must be performed while the A-D converter
halts (in other words, before a trigger is generated); this must be done
independent of the operation mode of the A-D converter.
• Each bit of the A-D control register 0, except bit 6
• Each bit of the A-D control register 1
• A-D register i (when the comparator function is selected)
• Comparator function select register 0
Especially, when the VREF connection select bit is cleared from “1” to “0,”
an interval of 1
µs or more must be elapsed before occurrence of a trigger.



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