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7906 Datasheet(PDF) 324 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) 324 Page - Renesas Technology Corp

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A-D CONVERTER
7906 Group User’s Manual Rev.2.0
12-29
Fig. 12.10.2 Initial setting example for related registers in repeat sweep mode 0 (2)
12.10 Repeat sweep mode 0
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 12.10.1
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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