
CHAPTER 13 A/D CONVERTER
User’s Manual U17790EJ2V0UD
469
Table 13-2. Conversion Time Selection in Normal Conversion Mode (ADA0HS1 Bit = 0)
A/D Conversion Time
ADA0FR3 to
ADA0FR0
Bits
Stabilization Time + Conversion
Time + Wait Time
fXX = 32 MHz
fXX = 20 MHz
fXX = 16 MHz
fXX = 4 MHz
Trigger Response
Time
0000
66/fXX (13/fXX + 26/fXX + 27/fXX)
Setting prohibited Setting prohibited Setting prohibited 16.5
s
3/fXX
0001
131/fXX (26/fXX + 52/fXX + 53/fXX)
Setting prohibited 6.55
s
8.19
s
Setting prohibited
3/fXX
0010
196/fXX (39/fXX + 78/fXX + 79/fXX)
Setting prohibited 9.80
s
12.25
s
Setting prohibited
3/fXX
0011
259/fXX (50/fXX + 104/fXX + 105/fXX)
8.09
s
12.95
s
16.19
s
Setting prohibited
3/fXX
0100
311/fXX (50/fXX + 130/fXX + 131/fXX)
9.72
s
15.55
s
19.44
s
Setting prohibited
3/fXX
0101
363/fXX (50/fXX + 156/fXX + 157/fXX)
11.34
s
18.15
s
22.69
s
Setting prohibited
3/fXX
0110
415/fXX (50/fXX + 182/fXX + 183/fXX)
12.97
s
20.75
s
Setting prohibited Setting prohibited
3/fXX
0111
467/fXX (50/fXX + 208/fXX + 209/fXX)
14.59
s
23.35
s
Setting prohibited Setting prohibited
3/fXX
1000
519/fXX (50/fXX + 234/fXX + 235/fXX)
16.22
s
Setting prohibited Setting prohibited Setting prohibited
3/fXX
1001
571/fXX (50/fXX + 260/fXX + 261/fXX)
17.84
s
Setting prohibited Setting prohibited Setting prohibited
3/fXX
1010
623/fXX (50/fXX + 286/fXX + 287/fXX)
19.47
s
Setting prohibited Setting prohibited Setting prohibited
3/fXX
1011
675/fXX (50/fXX + 312/fXX + 313/fXX)
21.09
s
Setting prohibited Setting prohibited Setting prohibited
3/fXX
Others
Setting prohibited
Remark
Stabilization time:
A/D converter setup time (1
s or longer)
Conversion time:
Actual conversion time (2.6 to 10.4
s)
Wait time:
Wait time inserted before the next conversion
Trigger response time: If a software trigger, external trigger, or timer trigger is generated after the
stabilization time, it is inserted before the conversion time.
In the normal conversion mode, the conversion is started after the stabilization time elapsed from the
ADA0M0.ADA0CE bit is set to 1, and A/D conversion is performed only during the conversion time (2.6 to
10.4
s). Operation is stopped after the conversion ends and the A/D conversion end interrupt request
signal (INTAD) is generated after the wait time is elapsed.
Because the conversion operation is stopped during the wait time, operation current can be reduced.
Caution
Set as 2.6
s ≤ conversion time ≤ 10.4 s.
<R>