UPD78F0411GA-GAM-AX Datasheet, PDF (298/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 12 10-BIT SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER (μPD78F041x only)
Table 12-2. A/D Conversion Time Selection
(1) 2.7 V ≤ AVREF ≤ 5.5 V
A/D Converter Mode Register (ADM)
Conversion Time Selection
FR3 FR2 FR1 FR0 LV1 LV0
fPRS =
2 MHz
fPRS =
8 MHz
fPRS =
10 MHz
1
×
×
×
0
0 352/fPRS
Setting
0
0
0
0
0
0 264/fPRS
prohibited
0
0
0
1
0
0 176/fPRS
0
0
1
0
0
0 132/fPRS
0
0
1
1
0
0 88/fPRS
44.0 μs
0
1
0
0
0
0 66/fPRS
33.0 μs
0
1
0
1
0
0 44/fPRS
22.0 μs
44.0 μs
33.0 μs
22.0 μs
16.5 μs
11.0 μs^Note
8.3 μs^Note
Setting
prohibited
35.2 μs
26.4 μs
17.6 μs
13.2 μs
8.8 μs^Note
6.6 μs^Note
Setting
prohibited
Other than above
Setting prohibited
Note This can be set only when 4.0 V ≤ AVREF ≤ 5.5 V.
Conversion Clock (fAD)
fPRS/16
fPRS/12
fPRS/8
fPRS/6
fPRS/4
fPRS/3
fPRS/2
(2) 2.3 V ≤ AVREF < 2.7 V
A/D Converter Mode Register (ADM)
Conversion Time Selection
Conversion Clock (fAD)
FR3 FR2 FR1 FR0 LV1 LV0
fPRS =
2 MHz
fPRS =
5 MHz
fPRS =
8 MHz
0
0
0
0
0
1 480/fPRS Setting
Setting
60.0 μs
prohibited
prohibited
fPRS/12
0
0
0
1
0
1 320/fPRS
64.0 μs
40.0 μs
fPRS/8
0
0
1
0
0
1 240/fPRS
48.0 μs
30.0 μs
fPRS/6
0
0
1
1
0
1 160/fPRS
0
1
0
0
0
1 120/fPRS
60.0 μs
0
1
0
1
0
1 80/fPRS
40.0 μs
32.0 μs
Setting
prohibited
Setting
prohibited
fPRS/4
fPRS/3
fPRS/2
Other than above
Setting prohibited
Cautions 1. Set the conversion times with the following conditions.
• 4.0 V ≤ AVREF ≤ 5.5 V: Sampling + successive conversion time = 5 to 40 μs
(fAD = 0.6 to 3.6 MHz)
• 2.7 V ≤ AVREF < 4.0 V: Sampling + successive conversion time = 10 to 40 μs
(fAD = 0.6 to 1.8 MHz)
• 2.3 V ≤ AVREF < 2.7 V: Sampling + successive conversion time = 25 to 75 μs
(fAD = 0.6 to 1.48 MHz)
2. When rewriting FR3 to FR0, LV1, and LV0 to other than the same data, stop A/D conversion
once (ADCS = 0) beforehand.
3. Change LV1 and LV0 from the default value, when 2.3 V ≤ AVREF < 2.7 V.
4. The above conversion time does not include clock frequency errors. Select conversion time,
taking clock frequency errors into consideration.
Remark fPRS: Peripheral hardware clock frequency
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User’s Manual U18698EJ1V0UD