A-D CONVERTER
12.7 One-shot mode
12.7.2 One-shot mode operation
✕ The A-D converter starts its operation when the A-D conversion start bit is set to “1.”
✕ The 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 comparison is completed after 14 cycles of φAD. Then,
the result of the comparison is stored into the AN pin comparator result bit.
i
✕ At the same time as step ✕, the A-D conversion interrupt request bit is set to “1.”
✕ 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.
✕ 8-bit and 10-bit resolution modes
Trigger generated
Conversion result
Convert input voltage at pin ANi.
A-D register i
A-D conversion interrupt request occurs.
A-D converter halts.
✕ Comparator function
Trigger generated
Comparison result
AN
result bit
i pin comparator
Compare input voltage at pin ANi.
A-D conversion interrupt request occurs.
A-D converter halts.
Fig. 12.7.3 Operation in one-shot mode
7906 Group User’s Manual Rev.2.0
12-21
RENESAS [ RENESAS TECHNOLOGY CORP ]
