CHAPTER 10 A/D CONVERTER
User’s Manual U17446EJ3V1UD
165
(1) A/D converter mode register (ADM)
This register sets the conversion time for analog input to be A/D converted, and starts/stops conversion.
ADM can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 10-3. Format of A/D Converter Mode Register (ADM)
Address: FF80H After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1
<0>
ADM
ADCS 0 FR2 FR1 FR0 0
0 ADCE
ADCS
A/D conversion operation control
0 Stops
conversion
operation
1
Note 1
Starts
conversion
operation
f
XP
= 8 MHz
f
XP
= 10 MHz
FR2 FR1 FR0
Reference
Voltage
Range
Note 2
Sampling
Time
Note 3
Conversion
Time
Note 4
Sampling
Time
Note 3
Conversion
Time
Note 4
Sampling
Time
Note 3
Conversion
Time
Note 4
0 0 0
AV
REF
≥
4.5 V
12/f
XP
36/f
XP
1.5
μ
s 4.5
μ
s 1.2
μ
s 3.6
μ
s
1 0 0
AV
REF
≥
4.0 V
24/f
XP
72/f
XP
3.0
μ
s 9.0
μ
s 2.4
μ
s 7.2
μ
s
1 1 0
96/f
XP
144/f
XP
12.0
μ
s 18.0
μ
s 9.6
μ
s 14.4
μ
s
1 0 1
48/f
XP
96/f
XP
6.0
μ
s 12.0
μ
s 4.8
μ
s 9.6
μ
s
0 1 0
48/f
XP
72/f
XP
6.0
μ
s 9.0
μ
s 4.8
μ
s 7.2
μ
s
0 0 1
AV
REF
≥
2.85 V
24/f
XP
48/f
XP
3.0
μ
s 6.0
μ
s
Setting
prohibited
(2.4
μ
s)
Setting
prohibited
(4.8
μ
s)
1 1 1
176/f
XP
224/f
XP
22.0
μ
s 28.0
μ
s 17.6
μ
s 22.4
μ
s
0 1 1
AV
REF
≥
2.7 V
88/f
XP
112/f
XP
11.0
μ
s 14.0
μ
s
Setting
prohibited
(8.8
μ
s)
Setting
prohibited
(11.2
μ
s)
ADCE
Comparator operation control
Note 5
0
Note 1
Stops operation of comparator
1
Enables operation of comparator
Remarks 1.
f
XP
: Oscillation frequency of clock to peripheral hardware
2.
The conversion time refers to the total of the sampling time and the time from successively
comparing with the sampling value until the conversion result is output.
Note 1.
Even when the ADCE = 0 (comparator operation stopped), the A/D conversion operation starts if
the ADCS is set to 1. However, the first conversion data is out of the guaranteed-value range, so
ignore it.
Содержание 78K0S/KB1+
Страница 2: ...User s Manual U17446EJ3V1UD 2 MEMO ...