CHAPTER 11 A/D CONVERTER
User’s Manual U13850EJ6V0UD
436
(2/2)
Selection of conversion time
f
XX
ADPS
FR2
FR1
FR0
Conversion time
Note 1
+ stabilization time
Note 2
20 MHz
Note 3
12.58 MHz
0
0
0
0
168/f
XX
8.4
µ
s
Setting prohibited
0
0
0
1
120/f
XX
6.0
µ
s
9.5
µ
s
0
0
1
0
84/f
XX
Setting prohibited
6.7
µ
s
0
0
1
1
60/f
XX
Setting prohibited
Setting prohibited
0
1
0
0
48/f
XX
Setting prohibited
Setting prohibited
0
1
0
1
36/f
XX
Setting prohibited
Setting prohibited
0
1
1
0
Setting prohibited
Setting prohibited
Setting prohibited
0
1
1
1
12/f
XX
Setting prohibited
Setting prohibited
1
0
0
0
168/f
XX
+ 64/f
XX
8.4 + 4.2
µ
s
Setting prohibited
1
0
0
1
120/f
XX
+ 60/f
XX
6.0 + 3.0
µ
s
9.5 + 4.8
µ
s
1
0
1
0
84/f
XX
+ 42/f
XX
Setting prohibited
6.7 + 3.3
µ
s
1
0
1
1
60/f
XX
+ 30/f
XX
Setting prohibited
Setting prohibited
1
1
0
0
48/f
XX
+ 24/f
XX
Setting prohibited
Setting prohibited
1
1
0
1
36/f
XX
+ 18/f
XX
Setting prohibited
Setting prohibited
1
1
1
0
Setting prohibited
Setting prohibited
Setting prohibited
1
1
1
1
12/f
XX
+ 6/f
XX
Setting prohibited
Setting prohibited
EGA1
EGA0
Valid edge specification for external trigger signal
0
0
No edge detection
0
1
Detection at falling edge
1
0
Detection at rising edge
1
1
Detection at both rising and falling edges
ADPS
Comparator control when A/D conversion is stopped (ADCS = 0)
0
Comparator on
1
Comparator off
Notes 1.
Conversion time (actual A/D conversion time).
Always set the time to 5
µ
s
≤
Conversion time
≤
10
µ
s.
2.
Stabilization time (setup time of A/D converter)
Each A/D conversion requires “conversion time + stabilization time”. There is no stabilization time
when ADPS = 0.
3.
Only in the V850/SB1.
Cautions 1.
The A/D converter cannot be used when the operation frequency is 2.4 to 3.6 MHz.
2.
Cut the current consumption by setting ADPS to 1 when ADCS = 0.
Содержание V850/SB1
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