Analog Input Enable / A/D Converter Select Register - Fujitsu MB90390 Series Hardware Manual

18.4.1

Analog Input Enable / A/D Converter Select Register

The MB90390 series has 15 analog inputs but only one A/D converter with 8 inputs.
Therefore, the special bit ADSEL can be used to select the analog input channels.
■ Upper Bits of the Analog Input Enable / A/D Converter Select Register (ADER1)
Figure 18.4-2 Configuration of the Upper Bits of Analog Input Enable / A/D Converter Select Register
bit15
Address
ADSEL ADE14 ADE13 ADE12 ADE11 ADE10 ADE9
00000D
H
R/W
R/W : Readable and writable
: Initial value
■ Lower Bits of the Analog Input Enable Register (ADER0)
Figure 18.4-3 Configuration of the Lower Bits of the Analog Input Enable Register (ADER0)
bit7
Address
ADE7
00000C
H
R/W
R/W : Readable and writable
: Initial value
bit14 bit13 bit12 bit11
R/W R/W R/W R/W
bit6 bit5 bit4 bit3
ADE6 ADE5 ADE4 ADE3
R/W R/W R/W R/W
CHAPTER 18 8/10-BIT A/D CONVERTER
(ADER1)
bit10 bit9 bit8
ADE8
R/W R/W R/W
ADEx
Analog input enable bits
0 Port input mode (Port B).
1 Analog input mode (Initial value).
ADSEL A/D converter input selection bit
0 AN0 to AN7 (Port 6) are selected as inputs.
1 AN8 to AN14 (Port B) are selected as inputs.
bit2 bit1 bit0
ADE2 ADE1 ADE0
R/W R/W R/W
ADEx Analog input enable bits
0 Port input mode (Port 6).
1 Analog input mode (Initial value).
Initial value
01111111
B
Initial value
11111111
B
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