7733 datasheet(560/940 Pages) RENESAS

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APPENDIX

7733 Group User’s Manual

21-12

Appendix 3. Control registers

A-D control register 0

A-D control register 1

A-D control register 1 (address 1F16)

Bit

Bit name

At reset

Functions

0 0: Pins AN0 and AN1 (2 pins)

0 1: Pins AN0 to AN3 (4 pins)

1 0: Pins AN0 to AN5 (6 pins) (Note 2)

1 1: Pins AN0 to AN7 (8 pins)

b1 b0

Not implemented.

Undefined

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

When an external trigger is selected, pin AN5 cannot be used as an analog input pin.

Writing to each bit of the A-D control register 1 must be performed while the A-D

converter stops operating.

When the VREF connection selection bit is cleared from “1” to “0,” wait for an interval of 1

µs or more passed, and then start A-D conversion.

8/10-bit mode selection bit

0: 8-bit resolution

1: 10-bit resolution

A-D sweep pin selection bits

(Valid in the single sweep and

repeat sweep modes.)

(Note 1)

Must be fixed to “0.”

VREF connection selection

bit

(Note 4)

0: Pin VREF is connected.

1: Pin VREF is disconnected.

(High impedance)

Not implemented.

Undefined

–

Notes 1:

A-D control register 0 (address 1E16)

Bit

A-D conversion frequency

(

f AD ) 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 selected.

0 0 1: AN1 is selected.

0 1 0: AN2 is selected.

0 1 1: AN3 is selected.

1 0 0: AN4 is selected.

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

1 1 0: AN6 is selected.

1 1 1: AN7 is selected.

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 AN5 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:

–

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