7540 datasheet(208/366 Pages) RENESAS

208 / 366 page

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REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.8 A/D converter

2.8.3 A/D converter application examples

(1) Setting of A/D converter

Figure 2.8.7 shows the relevant registers setting.

Fig. 2.8.7 Relevant registers setting

Process 2: Set A/D control register.

b7b0

A/D control register (ADCON) [Address 3416]

Analog input pins selected

b2b1b0

0 0 0: P20/AN0

0 0 1: P21/AN1

0 1 0: P22/AN2

0 1 1: P23/AN3

1 0 0: P24/AN4

1 0 1: P25/AN5

1 1 0: P26/AN6 (Note)

1 1 1: P27/AN7 (Note)

b7b0

Interrupt control register 2 (ICON2) [Address 3F16]

Note: These can be used only for 36-pin version.

b7b0

A/D conversion interrupt disabled

Process 1: Disable A/D conversion interrupt.

Process 3: In order not to execute the no requested interrupt processing, set “0” (no requested)

to the A/D conversion interrupt request bit.

Interrupt request register 2 (IREQ2) [Address 3D16]

No A/D conversion interrupt request issued

A/D control register (ADCON) [Address 3416]

Start A/D conversion

A/D conversion interrupt enabled

Interrupt control register 2 (ICON2) [Address 3F16]

Process 4: When the interrupt is used, set “1” (interrupt enabled) to

the A/D conversion interrupt enable bit.

Process 5: Start A/D conversion.

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