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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-27

12.9 Single sweep mode

12.9.2 Single sweep mode operation

➀ The A-D converter starts its operation for the input voltage at pin AN0 when the A-D conversion start

bit is set to “1.”

➁ The A-D conversion for the input voltage at pin AN0 is completed after 49 cycles of

φAD in the 8-

bit resolution mode, or 59 cycles of

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

successive approximation register (conversion result) are transferred to the A-D register 0.

When the comparator function is selected, the comparison for pin AN0 is completed after 14 cycles

φAD. Then, the result of the comparison is stored into the AN0 pin comparator result bit.

➂ The operations for all selected analog input pins are performed.

In the 8-bit and 10-bit resolution modes, the conversion result is transferred to the corresponding

A-D register i each time when the A-D conversion per one pin is completed. When the comparator

function is selected, the comparison result is stored into the ANi pin comparator result bit each time

the comparison for one pin is completed.

➃ When step ➂ is completed, the A-D conversion interrupt request bit is set to “1.”

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

Note that the operation time for pins AN0 to AN4 is equivalent to the time for 6 pins when the A-D sweep

pin select bits (bits 1, 0 at address 1F16) = “102.”

Figure 12.9.3 shows the operation in the single sweep mode.

Fig. 12.9.3 Operation in single sweep mode

Convert input voltage at pin ANi

Compare input voltage at pin ANi

A-D converter halts.

A-D converter interrupt request occurs.

Trigger generated

Conversion result

A-D register 0

Convert input voltage at pin AN1

Compare input voltage at pin AN1

Convert input voltage at pin AN0

Compare input voltage at pin AN0

Comparison result

AN0 pin comparator result bit

Conversion result

A-D register 1

Comparison result

AN1 pin comparator result bit

Conversion result

A-D register i

Comparison result

ANi pin comparator result bit

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