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Chapter 15
A/D Converter
Preliminary User’s Manual U15839EE1V0UM00
(1)
A/D converter mode register (ADM)
The ADM register is an 8-bit register that enables A/D conversion and the conversion time. It can
be read or written in 1-bit or 8-bit units. However, writing to the ADM register during A/D
conversion operation interrupts the conversion operation and the data is lost. The conversion
operation restarts from the beginning. If the ADCS bit is cleared (0) during conversion operation,
the conversion is aborted and the conversion operation is stopped.
While the ADCS bit is cleared (0), all DC current passes are cut between AV
DD
and AV
SS
, and
between AV
REF
and AV
SS
.
Figure 15-2:
A/D Converter Mode Register (ADM)
Notes: 1. The bits FR0, FR1, FR2 and FR3 must not be changed while ADCS bit is set (1).
2. Conversion time (actual A/D conversion time)
Always set the time to 5 µs
≤
Conversion time
≤
12 µs
Caution:
Be sure not to change the setting of bits 0, 1 and 6 from their reset value (0). If these
bits are set (1), the operation is not guaranteed.
7
6
5
4
3
2
1
0
Address
Initial
value
ADM
ADCS
0
FR3
FR2
FR1
FR0
0
0
FFFFF200H
0000H
Bit Position
Bit Name
Function
7
ADCS
Specifies enabling or disabling A/D conversion.
0: Conversion operation stop
1: Conversion operation enable
5 to 2
FR3 to
FR0
Specifies the conversion time
Remark:
f
PCLK
: Internal peripheral clock.
FR3
FR2
FR1
FR0
Conversion Clocks
Conversion Time [µs]
f
PCLK
= 20 MHz f
PCLK
= 16 MHz
0
1
0
1
84
-
5.25
0
1
1
0
96
-
6.0
0
1
1
1
108
5.4
6.75
1
0
0
0
120
6.0
7.5
1
0
0
1
144
7.2
9.0
1
0
1
0
168
8.4
10.5
1
0
1
1
192
9.6
12
1
1
0
0
216
10.8
-
Others
Setting prohibited
-
-
Содержание mPD703128
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