7733 datasheet(290/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–25

9.7.2 Operation in single sweep mode

Figure 9.7.2 shows the conversion operation in the single sweep mode.

(1) When internal trigger is selected

When the A-D conversion start flag is set to “1,” the A-D converter starts A-D conversion for an input

voltage of pin AN0.

The A-D conversion for pin AN0 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 0.

•49 cycles of

φAD have passed when resolution = 8 bits

•59 cycles of

φAD have passed when resolution = 10 bits

A-D conversion is performed for all analog input pins selected. Each time A-D conversion is completed

for a pin, the conversion result is transferred to the A-D register i which corresponds to the pin.

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

“1” at completion of .

The A-D conversion start flag is cleared to “0,” and 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 A-D conversion for the input voltage of pin AN0.

The A-D conversion for pin AN0 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 0.

•49 cycles of

φAD have passed when resolution = 8 bits

•59 cycles of

φAD have passed when resolution = 10 bits

A-D conversion is performed for all analog input pins selected. Each time A-D conversion is completed

for a pin, the conversion result is transferred to the A-D register i which corresponds to the pin.

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

“1” at completion of .

The A-D converter stops operating.

______

The A-D conversion start flag remains set to “1” after this. Accordingly, when pin ADTRG’s level goes from

______

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

“L” during A-D conversion, the A-D converter quits the conversion which is performed at that time and

restarts it from .

9.7 Single sweep mode

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