7721 datasheet(475/577 Pages) RENESAS

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APPENDIX

Appendix 3. Control registers

7721 Group User’s Manual

17–12

A-D control register

A-D control register (Address 1E16)

Bit

A-D conversion frequency

( AD) select bit

A-D conversion start bit

Trigger select bit

A-D operation mode select bit

Bit name

At reset

Undefined

Functions

0 0 0 : AN0 selected

0 0 1 : AN1 selected

0 1 0 : AN2 selected

0 1 1 : AN3 selected

1 0 0 : AN4 selected

1 0 1 : AN5 selected

1 1 0 : AN6 selected

1 1 1 : AN7 selected (Note 2)

b2 b1 b0

0 : Internal trigger

1 : External trigger

0 0 : One-shot mode

0 1 : Repeat mode

1 0 : Single sweep mode

1 1 : Repeat sweep mode

0 : Stop A-D conversion

1 : Start A-D conversion

b4 b3

Notes 1: These bits are invalid in the single sweep and repeat sweep mode. (They may be

either “0” or “1.”)

2: When selecting an external trigger, the AN7 pin cannot be used as an analog input

pin.

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

the A-D converter halts.

Analog input select bits

(Valid in one-shot and repeat

modes) (Note 1)

Undefined

0 : f2 divided by 4

1 : f2 divided by 2

A-D sweep pin select register

A-D sweep pin select register (Address 1F16)

Bit

Bit name

At reset

Undefined

Functions

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

2: When selecting an external trigger, the AN7 pin cannot be used as an analog input pin.

3: Writing to each bit of the A-D sweep pin select register must be performed while the

A-D converter halts.

7 to 2

0 0 : AN0, AN1 (2 pins)

0 1 : AN0 to AN3 (4 pins)

1 0 : AN0 to AN5 (6 pins)

1 1 : AN0 to AN7 (8 pins) (Note 2)

A-D sweep pin select bits

(Valid in single sweep and repeat

sweep modes) (Note 1)

b1 b0

Nothing is assigned.

–

A-D register i

A-D register i (i = 0 to 7) (Addresses 2016, 2216, 2416,

2616, 2816, 2A16, 2C16, 2E16)

Bit

7 to 0

At reset

Undefined

Functions

Reads an A-D conversion result.

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