CHAPTER 13 A/D CONVERTER
652
User’s Manual U14492EJ3V0UD
(2) A/D scan mode registers 01 and 11 (ADSCM01, ADSCM11)
The ADSCMn1 registers are 16-bit registers that set the conversion time of the A/D converter.
The ADSCMn1 register can be read/written in 16-bit units.
When the higher 8 bits of the ADSCMn1 register are used as the ADSCMn1H register, and the lower 8 bits
are used as the ADSCMn1L register, the ADSCMn1H register can be read/written in 8-bit or 1-bit units, and
the ADSCMn1L register is read-only in 8-bit units.
Caution
Do not write to the ADSCMn1 registers during A/D conversion operation. If a write is
performed, conversion operation is suspended and subsequently terminates.
14
0
13
0
12
0
2
0
3
0
4
0
5
0
6
0
7
0
8
FR0
9
FR1
10
FR2
11
0
15
0
1
0
0
0
14
0
13
0
12
0
2
0
3
0
4
0
5
0
6
0
7
0
8
FR0
9
FR1
10
FR2
11
0
15
0
1
0
0
0
ADSCM01
Address
FFFFF202H
Initial value
0000H
ADSCM11
Address
FFFFF242H
Initial value
0000H
Bit Position
Bit Name
Function
Specifies conversion time.
Conversion Time (
µ
s)
Note
FR2
FR1
FR0
Conversion Clocks
f
XX
= 50 MHz
f
XX
= 40 MHz
f
XX
= 33 MHz
0
0
0
344
6.88
8.60
−
0
0
1
248
−
6.20
7.51
0
1
0
176
−
−
5.33
0
1
1
128
−
−
−
1
0
0
104
−
−
−
1
0
1
80
−
−
−
1
1
0
56
−
−
−
1
1
1
Setting prohibited
−
−
−
10 to 8
FR2 to
FR0
Note
This is the time from sampling until conversion termination.
Sampling time = (Conversion clocks
−
8)/6
×
f
XX
Caution Be sure to secure the conversion time within a range of 5 to 10
µµµµ
s.
Conversion time = f
XX
××××
Conversion clocks
Remark
f
XX
: Internal system clock
Содержание V850E/IA1 mPD703116
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