7906 datasheet(301/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-6

Fig. 12.2.3 Structure of A-D control register 1

12.2 Block description

Undefined

–

A-D control register 1 (Address 1F16

)

A-D sweep pin select bits

(Valid in the single sweep mode and

repeat sweep mode 0.)

(Note 1)

Fix this bit to “0.”

Resolution select bit

A-D conversion frequency (

φAD) select

bit 1

Fix this bit to “0.”

VREF connection select bit (Note 4)

The value is “0” at reading.

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : Pins AN0 and AN1 (2 pins)

0 1 : Pins AN0 to AN3 (4 pins) (Note 2)

1 0 : Pins AN0 to AN4 (5 pins) (Notes 2, 3)

1 1 : Do not select.

b1 b0

0 : 8-bit resolution mode

1 : 10-bit resolution mode

See Table 12.2.1.

0 : Pin VREF is connected.

1 : Pin VREF is disconnected.

Bit name

Bit

Function

At reset

R/W

Notes 1: These bits are invalid in the one-shot and repeat modes. (They may be either “0” or “1.”)

2: When using pin AN3, be sure that the D-A0 output enable bit (bit 0 at address 9616) = “0” (output disabled).

3: When using pin AN4, be sure that the D-A1 output enable bit (bit 1 at address 9616) = “0” (output disabled).

4: When this bit is cleared from “1” to “0,” be sure to start the A-D conversion after an interval of 1 µs or more has elapsed.

5: Writing to each bit of the A-D control register 1 must be performed while the A-D converter halts, regardless of the A-D

operation mode.

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