NEC 78K0 Series User Manual page 309
8-bit single-chip microcontrollers
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A/D Converter Mode Register (ADM)
FR2
FR1
FR0
LV1
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
Other than above
Note This can be set only when 4.0 V ≤ AV
A/D Converter Mode Register (ADM)
FR2
FR1
FR0
LV1
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
Other than above
Cautions 1. Set the conversion times with the following conditions.
• 4.0 V ≤ AV
(f
= 0.6 to 3.6 MHz)
AD
• 2.7 V ≤ AV
(f
= 0.6 to 1.8 MHz)
AD
• 2.3 V ≤ AV
(f
= 0.6 to 1.48 MHz)
AD
2. When rewriting FR2 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 ≤ AV
4. The above conversion time does not include clock frequency errors. Select conversion time,
taking clock frequency errors into consideration.
Remark f
: Peripheral hardware clock frequency
PRS
CHAPTER 13 A/D CONVERTER
Table 13-2. A/D Conversion Time Selection
(1) 2.7 V ≤ AV
Conversion Time Selection
LV0
f
=
f
PRS
2 MHz
10 MHz
0
264/f
26.4
Setting
PRS
prohibited
0
176/f
17.6
PRS
0
132/f
13.2
PRS
0
88/f
8.8
PRS
µ
0
66/f
33.0
s
6.6
PRS
µ
0
44/f
22.0
s
Setting
PRS
prohibited
Setting prohibited
≤ 5.5 V.
REF
(2) 2.3 V ≤ AV
Conversion Time Selection
LV0
f
=
PRS
2 MHz
1
480/f
Setting
PRS
prohibited
1
320/f
PRS
1
240/f
PRS
1
160/f
PRS
µ
1
120/f
60.0
s
PRS
µ
1
80/f
40.0
s
PRS
Setting prohibited
≤ 5.5 V: Sampling + successive conversion time = 5 to 30
REF
< 4.0 V: Sampling + successive conversion time = 10 to 30
REF
< 2.7 V: Sampling + successive conversion time = 25 to 62
REF
Preliminary User's Manual U17260EJ3V1UD
≤ 5.5 V
REF
Conversion
(f
)
Clock
AD
=
f
=
PRS
PRS
Note
20 MHz
µ
µ
Note
s
13.2
s
f
/12
PRS
µ
µ
Note
s
8.8
s
f
/8
PRS
µ
µ
Note
s
6.6
s
f
/6
PRS
µ
Note
s
f
/4
Setting
PRS
µ
prohibited
Note
s
f
/3
PRS
f
/2
PRS
< 2.7 V
REF
Conversion
Clock
(f
)
AD
f
=
PRS
5 MHz
Setting
f
/12
PRS
prohibited
µ
64.0
s
f
/8
PRS
µ
48.0
s
f
/6
PRS
µ
32.0
s
f
/4
PRS
Setting
f
/3
PRS
prohibited
Setting
f
/2
PRS
prohibited
Conversion Time Configuration
SAR
Sampling Successive
Clear
Conversion
Time
Generation
2/f
6/f
12/f
AD
AD
AD
Conversion Time Configuration
SAR
Sampling Successive
Clear
Conversion
Time
Generation
2/f
24/f
12/f
AD
AD
AD
µ
s
µ
s
µ
s
< 2.7 V.
REF
ADCR
Transfer,
INTAD
2/f
AD
ADCR
Transfer,
INTAD
2/f
AD
309
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