7906 datasheet(321/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-26

Fig. 12.9.2 Initial setting example for related registers in single sweep mode (2)

12.9 Single sweep mode

Setting of A-D conversion start bit to “1.”

A-D control register 0

(Address 1E16)

A-D conversion start bit

Interrupt priority level

A-D conversion interrupt control register

(Address 7016)

Interrupt priority level select bits

Set the level to one of 1 through 7 when using this interrupt.

Set the level to 0 when disabling interrupts.

Port P7 direction register

(Address 1116)

Clear the bits, corresponding to

the selected analog input pins,

to “0.”

AN0

AN1

AN2

AN3

AN4

Interrupt request bit

“0” : No interrupt requested

Operation starts.

Trigger generated

Continued from preceding Figure 12.9.

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.

7906 Datasheet(PDF) 321 Page - Renesas Technology Corp