4524 datasheet(49/161 Pages) RENESAS

49 / 161 page

Rev.2.00

Jul 27, 2004

page 49 of 159

REJ03B0091-0200Z

4524 Group

Fig. 35 Setting registers

A/D control register Q2

AIN4 pin function selected

✕✕✕

(Bit 3)

(Bit 0)

(7) A/D conversion timing chart

Figure 34 shows the A/D conversion timing chart.

Fig. 34 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 P30/AIN4 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 AIN4 pin function with the bit 0 of the register Q3. Se-

lect the AIN4 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

A/D control register Q1

AIN4 pin selected

A/D conversion mode

010

(Bit 3)

(Bit 0)

✕: Set an arbitrary value.

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