7733 datasheet(296/940 Pages) RENESAS

Nome de Peças	7733

Descrição Electrónicos	16-BIT SINGLE-CHIP MICROCOMPUTER

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A-D CONVERTER

7733 Group User’s Manual

9–31

9.9 Precautions for A-D converter

1. Writing to each bit (except bit 6) of the A-D control register 0 and each bit of the A-D control register 1

must be performed while the A-D converter stops operating, in other words, before a trigger is generated.

When the VREF connection selection bit is cleared from “1” to “0,” in other words, when pin VREF is

disconnected from the resistor ladder network, wait for an period of 1

µs or more, and then generate a

trigger.

2. When an external trigger is selected, pin AN5 cannot be used as an analog input pin because this pin

is disconnected from the comparator. If pin AN5 is selected as an analog input pin when an external

trigger is selected, the A-D converter operates, but an undefined value is stored into the A-D register 5.

3. When using the A-D converter, refer to section “Appendix 8. Countermeasures against noise,” also.

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