4502 datasheet(46/214 Pages) RENESAS

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FUNCTION BLOCK OPERATIONS

1-34

Rev.2.01

Feb 02, 2005

4502 Group

HARDWARE

REJ09B0193-0201

Table 13 Change of successive comparison register AD during A/D conversion

Comparison voltage (Vref) value

Change of successive comparison register AD

At starting conversion

✼1: 1st comparison result

✼3: 3rd comparison result

✼9: 9th comparison result

✼2: 2nd comparison result

✼8: 8th comparison result

✼A: 10th comparison result

1st comparison

2nd comparison

3rd comparison

After 10th comparison

completes

✼1

-----

✼2

✼3

✼8

✼9

✼A

A/D conversion result

VDD

1024

-------------

Fig. 30 Setting registers

A/D control register Q1

AIN1 pin selected

A/D conversion mode

001

(Bit 3)

(Bit 0)

(7) A/D conversion timing chart

Figure 29 shows the A/D conversion timing chart.

Fig. 29 A/D conversion timing chart

(8) How to use A/D conversion

How to use A/D conversion is explained using as example in which

the analog input from P21/AIN1 pin is A/D converted, and the high-

order 4 bits of the converted data are stored in address M(Z, X, Y)

= (0, 0, 0), the middle-order 4 bits in address M(Z, X, Y) = (0, 0, 1),

and the low-order 2 bits in address M(Z, X, Y) = (0, 0, 2) of RAM.

The A/D interrupt is not used in this example.

➀ Select the AIN1 pin function and A/D conversion mode with the

➁ Execute the ADST instruction and start A/D conversion.

➂ Examine the state of ADF flag with the SNZAD instruction to de-

termine the end of A/D conversion.

➃ Transfer the low-order 2 bits of converted data to the high-order

2 bits of register A (TALA instruction).

➄ Transfer the contents of register A to M (Z, X, Y) = (0, 0, 2).

➅ Transfer the high-order 8 bits of converted data to registers A

and B (TABAD instruction).

➆ Transfer the contents of register A to M (Z, X, Y) = (0, 0, 1).

➇ Transfer the contents of register B to register A, and then, store

into M(Z, X, Y) = (0, 0, 0).

ADST instruction

A/D conversion

completion flag (ADF)

62 machine cycles

DAC operation signal

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