A-D CONVERTER
12.8 Repeat mode
12.8.2 Repeat mode operation
✕ The A-D converter starts its operation when the A-D conversion start bit is set to “1.”
✕ The 1st A-D conversion 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 i.
When the comparator function is selected, the 1st comparison is completed after 14 cycles of φAD
Then, the result of the comparison is stored into the AN pin comparator result bit.
.
i
✕ The A-D converter repeats its operation until the A-D conversion start bit is cleared to “0” by
software. The conversion result is transferred to the A-D register i each time the conversion is
completed. When the comparator function is selected, the comparison result is stored into the AN
pin comparator result bit each time the comparison is completed.
i
Figure 12.8.3 shows the operation in the repeat mode.
✕ 8-bit and 10-bit resolution modes
Trigger generated
Conversion result
A-D register i
Convert input voltage at pin ANi.
✕ Comparator function
Trigger generated
Comparison result
Compare input voltage at pin AN
i.
ANi pin comparator
result bit
Fig. 12.8.3 Operation in repeat mode
7905 Group User’s Manual Rev.1.0
12-28
RENESAS [ RENESAS TECHNOLOGY CORP ]
