4501 datasheet(151/212 Pages) RENESAS

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2.4 A/D converter

2-34

Rev.2.01

Feb 07, 2005

4501 Group

APPLICATION

REJ09B0192-0201

2.4.1 Related registers

(1)

A/D control register Q1

A/D operation mode control bit and analog input pin selection bits are assigned to register Q1.

Set the contents of this register through register A with the TQ1A instruction. The TAQ1 instruction

can be used to transfer the contents of register Q1 to register A.

Table 2.4.1 shows the A/D control register Q1.

Table 2.4.1 A/D control register Q1

A/D control register Q1

at reset : 00002

at RAM back-up : state retained

R/W

A/D operation mode control bit

Not used

Analog input pin selection bits

Q13

Q12

Notes 1: “R” represents read enabled, and “W” represents write enabled.

2: When A/D converter is used, Q12 is not used.

2.4.2 A/D converter application examples

(1)

A/D conversion mode

Outline: Analog input signal from a sensor can be converted into digital values.

Specifications: Analog voltage values from a sensor is converted into digital values by using a 10-

bit successive comparison method. Use the AIN0 pin for this analog input.

Figure 2.4.2 shows the A/D conversion mode setting example.

Q11

A/D conversion mode

Comparator mode

This bit has no function, but read/write is enabled.

Q10

Selected pins

AIN0

AIN1

Not available

Q11

Q10

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