7733 datasheet(269/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–4

A-D control register 0 (address 1E 16)

Bit

A-D conversion frequency

(

) selection flag

A-D conversion start flag

Trigger selection bit

A-D operation mode selection bits

Bit name

At reset

Undefined

Functions

0 0 0: AN0 is stopped.

0 0 1: AN1 is stopped.

0 1 0: AN2 is stopped.

0 1 1: AN3 is stopped.

1 0 0: AN4 is stopped.

1 0 1: AN5 is stopped. (Note 2)

1 1 0: AN6 is stopped.

1 1 1: AN7 is stopped.

f2V: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

b2 b1 b0

0: Internal trigger

1: External trigger

0: f2/4V

1: f2/2

00: One-shot mode

01: Repeat mode

10: Single sweep mode

11: Repeat sweep mode

0: A-D conversion is stopped.

1: A-D conversion is started.

b4b3

These bits are ignored in the single sweep and repeat sweep modes. (They may be “0”

or “1.”)

When an external trigger is selected, pin AN 5 cannot be used as an analog input pin.

Writing to each bit (except bit 6) of the A-D control register 0 must be performed while the

A-D converter stops operating.

Analog input selection bits

(Valid in the one-shot and repeat

modes) (Note 1)

Notes 1:

9.2.1 A-D control register 0

Figure 9.2.2 shows the structure of A-D control register 0. A-D operation mode selection bits select an

operation mode of A-D converter. The other bits are described below.

9.2 Block description

Fig. 9.2.2 Structure of A-D control register 0

(1) Analog input selection bits (bits 2 to 0)

These bits are used to select an analog input pin in the one-shot and repeat modes. (Refer to section

“9.2.5 Port P7 direction register.”)

When switching the operating mode to the one-shot or repeat mode after A-D conversion is once

performed in the single sweep or repeat sweep mode, set these bits again.

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