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CHAPTER 14 A/D CONVERTER
252
Figure 14-2. A/D Converter Mode Register Format
Notes
1.
Set so that the A/D conversion time is 19.1
µ
s or more.
2.
Setting prohibited because A/D conversion time is less than 19.1
µ
s.
Cautions
1.
Set bit 0 to 1.
2.
To reduce power dissipation in the A/D converter when standby functions used, the bit 7 (CS)
should be cleared to 0 to stop the A/D conversion operation before executing a HALT or STOP
instruction.
3.
To restart the stopped A/D conversion operation, the interrupt request flag (ADIF) should be
cleared to 0 before starting the A/D conversion operation.
Remark
f
X
: Main system clock oscillation frequency
Symbol
<7>
<6>
5
4
3
2
1
0
Address
When Reset
R/W
ADM
CS
TRG
FR1
FR0
ADM3
ADM2
ADM1
1
FF80H
01H
R/W
ADM3 ADM2 ADM1
Analog Input Channel Selection
0
0
0
ANI0
0
0
1
ANI1
0
1
0
ANI2
0
1
1
ANI3
1
0
0
ANI4
1
0
1
ANI5
1
1
0
ANI6
1
1
1
ANI7
FR1
FR0
A/D Conversion Time Selection
Note 1
When operated at
When operated at
When operated at
f
X
= 10.0 MHz
f
X
= 8.38 MHz
f
X
= 4.19 MHz
0
0
160/f
X
Setting prohibited
Note 2
19.1
µ
s
38.1
µ
s
0
1
80/f
X
Setting prohibited
Note 2
Setting prohibited
Note 2
19.1
µ
s
1
0
200/f
X
20.0
µ
s
23.9
µ
s
47.7
µ
s
1
1
Setting prohibited
TRG
External Trigger Selection
0
No external trigger (software starts mode)
1
Conversion started by external trigger (hardware starts mode)
CS
A/D Conversion Operation Control
0
Operation stop
1
Operation start
Содержание 78014Y Series
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