CHAPTER 12 A/D CONVERTER
Preliminary User’s Manual U16315EJ1V0UD
244
(11) A/D converter sampling time and A/D conversion start delay time
The A/D converter sampling time differs depending on the set value of the A/D converter mode register (ADM).
The delay time exists until actual sampling is started after A/D converter operation is enabled.
When using a set in which the A/D conversion time must be strictly observed, care is required for the contents
shown in Figure 12-23 and Table 12-3.
Figure 12-23. Timing of A/D Converter Sampling and A/D Conversion Start Delay
ADCS
Wait
period
Conversion time
A/D
conversion
start delay
time
Sampling
time
Sampling timing
INTAD
ADCS
←
1 or ADS rewrite
Table 12-3. A/D Converter Sampling Time and A/D Conversion Start Delay Time (ADM Set Value)
A/D Conversion Start Delay Time
Note
FR2
FR1
FR0
Conversion Time
Sampling Time
MIN.
MAX.
0
0
0
288/f
X
40/f
X
32/f
X
36/f
X
0
0
1
240/f
X
32/f
X
28/f
X
32/f
X
0
1
0
192/f
X
24/f
X
24/f
X
28/f
X
1
0
0
144/f
X
20/f
X
16/f
X
18/f
X
1
0
1
120/f
X
16/f
X
14/f
X
16/f
X
1
1
0
96/f
X
12/f
X
12/f
X
14/f
X
Other than above
Setting prohibited
−
−
−
Note
The A/D conversion start delay time is the time after wait period. For the wait function, refer to
CHAPTER 29
CAUTIONS FOR WAIT
.
Remark
f
X
: X1 clock oscillation frequency