A/D Converter Mode Register Format - NEC PD78081(A) User Manual

7 6 5
Symbol
CS TRG FR1
ADM
ADM3
ADM2 ADM1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0
1
1 1 0
1 1 1
FR1 FR0 HSC
0 0 1
0 1 1
1 0 0
1 0 1
Other than above
TRG External Trigger Selection
0 No external trigger (software starts)
1 Conversion started by external trigger (hardware starts)
CS A/D Conversion Operation Control
0 Operation stop
1 Operation start
Notes 1. Set so that the A/D conversion time is 19.1 s or more.
2. Setting prohibited because A/D conversion time is less than 19.1 s.
Cautions 1. The following sequence is recommended for power consumption reduction of A/D
2. When restarting the stopped A/D conversion operation, start the A/D conversion
Remarks 1. f
2. MCS : Oscillation mode selection register (OSMS) bit 0
CHAPTER 10 A/D CONVERTER
Figure 10-2. A/D Converter Mode Register Format
4 3 2 1
FR0 ADM3 ADM2 ADM1 HSC
Analog Input Channel Selection
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
A/D Conversion Time Selection
f =5.0 MHz Operation
X
MCS=1
Note 2
80/f ( )
Setting prohibited
X
Note 2
40/f ( )
Setting prohibited
X
Note 2
50/f ( Setting prohibited )
X
100/f (20.0 s)
X
Setting prohibited
converter when the standby function is used: Clear bit 7 (CS) to 0 first to stop the
A/D conversion operation, and then execute the HALT or STOP instruction.
operation after clearing the interrupt request flag (ADIF) to 0.
: Main system clock oscillation frequency
X
0 Address
FF80H
Note 1
f
MCS=0 MCS=1
160/f (32.0 s) 80/f
X
Note 2
80/f ( ) 40/f
Setting prohibited
X
100/f (20.0 s) 50/f
X
200/f (40.0 s) 100/f
X
After
R/W
Reset
01H R/W
=4.19 MHz Operation
X
MCS=0
(19.1 s) 160/f
X
Note 2
( ) 80/f
Setting prohibited
X
Note 2
( Setting prohibited ) 100/f
X
(23.8 s) 200/f
X
(38.1 s)
X
(19.1 s)
X
(23.8 s)
X
(47.7 s)
X
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