CHAPTER 9 A/D CONVERTER
User’s Manual U11969EJ3V0UM00
299
(2) A/D converter mode register 1 (ADM1)
The ADM1 register is an 8-bit register which specifies the conversion operation time and trigger mode.
This register can be read/written in 8- or 1-bit units. However, when the data is written to the ADM1 register
during A/D conversion, the conversion operation is initialized and conversion is executed from the beginning
again.
Bit Position
Bit Name
Function
5 and 4
TRG1 and
Trigger Mode
TRG0
Specifies trigger mode.
TRG1 TRG0
Trigger Mode
0
0
A/D trigger mode
1
1
Timer trigger mode
1
0
External trigger mode
1
1
Setting prohibited
2 to 0
FR2 to FR0
Frequency
Specifies conversion operation time.
FR2
FR1
FR0
Number of
Conversion Operation Time (
µ
s)
Conversion Clock
φ
= 33 MHz
φ
= 25 MHz
φ
= 16 MHz
0
0
0
50
–
–
3.1
0
0
1
60
–
–
3.8
0
1
0
80
–
3.2
5.0
0
1
1
100
3.0
4.0
6.3
1
0
0
120
3.6
4.8
7.5
1
0
1
140
4.2
5.6
8.8
1
1
0
180
5.4
7.2
11.3
1
1
1
200
6.0
8.0
12.5
(3) A/D conversion result register (ADCR0 to ADCR7)
The ADCRn register is an 8-bit register holding the A/D conversion results. It is provided with eight 8-bit
registers.
This register can only be read in 8-/1-bit units.
Remark
n = 0 to 7
Address
FFFFF382H
7
0
ADM1
6
0
5
TRG1
4
TRG0
3
0
2
FR2
1
FR1
0
FR0
After reset
07H
Address
FFFFF390H to
FFFFF39EH
7
AD7
ADCRn
6
AD6
5
AD5
4
AD4
3
AD3
2
AD2
1
AD1
0
AD0
After reset
Undefined
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