CHAPTER 11 A/D CONVERTER
User’s Manual U12688EJ4V0UM00
320
(2) A/D converter mode register 1 (ADM1)
The ADM1 register is an 8-bit register that 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 an A/D conversion operation, the conversion operation is initialized and conversion is executed from the
beginning again.
Address
FFFFF382H
7
0
ADM1
6
TRG2
5
TRG1
4
TRG0
3
0
2
FR2
1
FR1
0
FR0
After reset
07H
Bit Position
Bit Name
Function
Trigger Mode
Specifies trigger mode.
TRG2
TRG1
TRG0
Trigger Mode
0
0
don’t
care
A/D trigger mode
0
1
0
Timer trigger mode (1-trigger mode)
0
1
1
Timer trigger mode (4-trigger mode)
1
1
0
External trigger mode
Other than above
Setting prohibited
6 to 4
TRG2 to
TRG0
Remark
The valid edge of the external input signal during the external trigger mode is
specified by bits 7 and 6 (ES531, ES530) of the external interrupt mode
register (INTM6). For details, refer to 7.3.8 (1) External interrupt mode
registers 1 to 6 (INTM1 to INTM6).
Frequency
Specifies conversion operation time. These bits control the conversion time to be same
value irrespective of oscillation frequency.
Conversion Operation Time (
µ
s)
Note
FR2
FR1
FR0
Number of
Conversion
Clocks
φ
=
40 MHz
φ
=
33 MHz
φ
=
25 MHz
φ
=
16 MHz
0
0
0
48 clocks
—
—
—
—
0
0
1
72 clocks
—
—
—
—
0
1
0
96 clocks
—
—
—
6.00
0
1
1
120 clocks
—
—
—
7.50
1
0
0
168 clocks
—
5.09
6.72
—
1
0
1
192 clocks
—
5.82
7.68
—
1
1
0
240 clocks
6.00
7.27
9.60
—
1
1
1
336 clocks
8.40
—
—
—
2 to 0
FR2 to
FR0
Note
Figures under Conversion Operation Time are target values.
Remark
φ
:
Internal system clock frequency
—: Setting prohibited
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