7733 datasheet(284/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–19

A-D conversion interrupt request occurs.

Trigger is generated.

Input voltage of ANi pin is converted.

A-D converter is stopped.

Conversion result

A-D register i

9.5.2 Operation in one-shot mode

Figure 9.5.2 shows the conversion operation in the one-shot mode.

(1) When internal trigger is selected

By setting the A-D conversion start flag to “1,” the A-D converter starts operating.

The A-D conversion is completed when one of the following conditions is satisfied, and then the

contents of the successive approximation register (in other words, the conversion result) is transferred

to the A-D register i.

•49 cycles of

φAD have passed when resolution = 8 bits

•59 cycles of

φAD have passed when resolution = 10 bits

When a UART2 trans./rece. interrupt is not used, the A-D conversion interrupt request bit is set to

“1” simultaneously with .

The A-D conversion start flag is cleared to “0,” and then the A-D converter stops operating.

(2) When external trigger is selected

______

If pin ADTRG’s level goes from “H” to “L” when the A-D conversion start flag = “1,” the A-D converter

starts operating.

The A-D conversion is completed when one of the following conditions is satisfied, and then the

contents of the successive approximation register (in other words, the conversion result) is transferred

to the A-D register i.

•49 cycles of

φAD have passed when resolution = 8 bits

•59 cycles of

φAD have passed when resolution = 10 bits

When a UART2 trans./rece. interrupt is not used, the A-D conversion interrupt request bit is set to

“1” simultaneously with .

The A-D converter stops operating.

The A-D conversion start flag remains set to “1” after the A-D converter stops operating. Accordingly, when

______

pin ADTRG’s level goes from “H” to “L”, the A-D converter restarts conversion from . Note that when pin

______

ADTRG

’s level goes from “H” to “L” during A-D conversion, the converter quits the conversion which is

performed at that time and restarts it from .

9.5 One-shot mode

Fig. 9.5.2 Conversion operation in one-shot mode

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