123
CHAPTER 10 A/D CONVERTER
Figure 10-2. A/D Converter Mode Register FormatNotes 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. The following sequence is recommended for power consumption reduction of A/Dconverter when the standby function is used: Clear bit 7 (CS) to 0 first to stop theA/D conversion operation, and then execute the HALT or STOP instruction.2. When restarting the stopped A/D conversion operation, start the A/D conversionoperation after clearing the interrupt request flag (ADIF) to 0.Remarks 1. fX: Main system clock oscillation frequency2. MCS : Oscillation mode selection register (OSMS) bit 0
CS
7
TRG
6
FR1 FR0
4
ADM3
3210
FF80H
Address
ADM
Symbol
ADM2 ADM1 HSC
5
01H
After
Reset
R/W
R/W
ADM3
0
0
0
0
1
1
1
1
ADM2
0
0
1
1
0
0
1
1
ADM1
0
1
0
1
0
1
0
1
Analog Input Channel Selection
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
TRG
0
1
External Trigger Selection
No external trigger (software starts)
Conversion started by external trigger (hardware starts)
FR1
0
0
1
1
FR0
0
1
0
0
Other than above
A/D Conversion Time SelectionNote 1
fX=5.0 MHz Operation
MCS=1
80/fX
(Setting prohibitedNote 2)
40/fX
(Setting prohibitedNote 2)
50/fX
(Setting prohibitedNote 2)
100/fX (20.0 s)
Setting prohibited
µ
MCS=0
160/fX (32.0 s)
80/fX (
Setting prohibited
Note 2)
100/fX (20.0 s)
200/fX (40.0 s)
fX=4.19 MHz Operation
MCS=1
80/fX (19.1 s)
40/fX (
Setting prohibited
Note 2)
50/fX (
Setting prohibited
Note 2)
100/fX (23.8 s)
MCS=0
160/fX (38.1 s)
80/fX (19.1 s)
100/fX (23.8 s)
200/fX (47.7 s)
µ
µ
µ

µµ

µ
µ
CS
0
1
A/D Conversion Operation Control
Operation stop
Operation start
HSC
1
1
0
1

µµ