CHAPTER 12 A/D CONVERTER

12.4.4A/D Enable Register (ADEN)

The ADEN register is used to select the analog input port that corresponds to different pins. Writing "1" to an appropriate ADEN register bit enables analog input.

A/D Enable Register (ADEN)

Figure 12.4-5shows the bit configuration of the A/D enable register.

Figure 12.4-5 A/D Enable Register (ADEN)

Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Initial value

0034H ADE7 ADE6 ADE5 ADE4 ADE3 ADE2

ADE1

ADE0

00000000B

 

R/W

R/W

R/W R/W

R/W

R/W

R/W

R/W

 

 

 

 

 

ADE7 to ADE0

 

 

 

A/D input bits

 

 

 

 

 

0

Port input

 

 

 

 

 

 

 

1

Analog input

 

R/W : Readable/Writable

 

 

 

 

 

 

 

: Initial value

 

 

 

 

 

 

 

 

An A/D input port can be used as a general-purpose I/O port.

The ADEN register is used to select the port that corresponds to the analog input.

Set "1" to the corresponding bit in the ADEN register for the port to be used for analog input. This prevents the DC pass when the middle level voltage is applied to the A/D input port.

When this register is to be used as the A/D input port, do not select the bit that indicates use of a pull-up resistor from the pull-up setting register.

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Fujitsu F202RA, MB89202 manual 12.4.4 A/D Enable Register Aden, 5 A/D Enable Register Aden

F202RA, MB89202 specifications

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