7906 datasheet(316/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-21

12.7 One-shot mode

12.7.2 One-shot mode operation

➀ The A-D converter starts its operation when the A-D conversion start bit is set to “1.”

➁ The A-D conversion is completed after 49 cycles of

φAD in the 8-bit resolution mode, or 59 cycles

φAD in the 10-bit resolution mode. Then, the contents of the successive approximation register

(conversion result) are transferred to the A-D register i.

When the comparator function is selected, the comparison is completed after 14 cycles of

φAD. Then,

the result of the comparison is stored into the ANi pin comparator result bit.

➂ At the same time as step ➁, the A-D conversion interrupt request bit is set to “1.”

➃ The A-D conversion start bit is cleared to “0,” and the A-D converter halts.

Figure 12.7.3 shows the operation in the one-shot mode.

Fig. 12.7.3 Operation in one-shot mode

Trigger generated

Convert input voltage at pin ANi.

A-D converter halts.

A-D conversion interrupt request occurs.

Conversion result

A-D register i

s 8-bit and 10-bit resolution modes

s Comparator function

Trigger generated

Compare input voltage at pin ANi.

A-D converter halts.

A-D conversion interrupt request occurs.

Comparison result

ANi pin comparator

result bit

7906 Datasheet(PDF) 316 Page - Renesas Technology Corp