
CHAPTER 13 A/D CONVERTER
Preliminary User’s Manual U17790EJ1V0UD
470
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
13/fXX + 26/fXX + 26/fXX
Setting prohibited
16.25
s
4/fXX
0001
26/fXX + 52/fXX + 52/fXX
Setting prohibited
6.5
s
8.125
s
Setting prohibited
5/fXX
0010
39/fXX + 78/fXX + 78/fXX
Setting prohibited
9.75
s
12.1875
s
Setting prohibited
6/fXX
0011
50/fXX + 104/fXX + 104/fXX
8.0625
s
12.9
s
16.125
s
Setting prohibited
7/fXX
0100
50/fXX + 130/fXX + 130/fXX
9.687.5
s
15.5
s
19.375
s
Setting prohibited
8/fXX
0101
50/fXX + 156/fXX + 156/fXX
11.3125
s
18.1
s
22.625
s
Setting prohibited
9/fXX
0110
50/fXX + 182/fXX + 182/fXX
12.9375
s
20.7
s
Setting prohibited
10/fXX
0111
50/fXX + 208/fXX + 208/fXX
14.5625
s
23.3
s
Setting prohibited
11/fXX
1000
50/fXX + 234/fXX + 234/fXX
16.1875
s
Setting prohibited
12/fXX
1001
50/fXX + 260/fXX + 260/fXX
17.8125
s
Setting prohibited
13/fXX
1010
50/fXX + 286/fXX + 286/fXX
19.4375
s
Setting prohibited
14/fXX
1011
50/fXX + 312/fXX + 312/fXX
21.0625
s
Setting prohibited
15/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.