CHAPTER 10 A/D CONVERTER
Preliminary User’s Manual U16846EJ1V0UD
200
(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). A
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 regarding the
contents shown in Figure 10-21 and Table 10-3.
Figure 10-21. Timing of A/D Converter Sampling and A/D Conversion Start Delay
ADCS
Wait
period
Conversion time
Conversion time
A/D
conversion
start delay
time
Sampling
time
Sampling timing
INTAD
ADCS
←
1 or ADS rewrite
Sampling
time
Table 10-3. 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 the wait period. For the wait function, see CHAPTER 25
CAUTIONS FOR WAIT.
Remark f
X
: High-speed system oscillation frequency