7733 datasheet(271/940 Pages) RENESAS

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A-D CONVERTER

7733 Group User’s Manual

9–6

A-D control register 1 (address 1F 16)

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 AN 5 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:

9.2.2 A-D control register 1

Figure 9.2.3 shows the structure of A-D control register 1.

9.2 Block description

Fig. 9.2.3 Structure of A-D control register 1

(1) A-D sweep pin selection bits (bits 1 and 0)

These bits are used to select analog input pins in the single sweep and repeat sweep modes. Refer

to section “9.2.5 Port P7 direction register.”

(2) VREF connection selection bit (bit 5)

This bit is used to disconnect the A-D converter’s resistor ladder network from the reference voltage

input pin (VREF) when not using the A-D converter.

When pin VREF is disconnected from the resistor ladder network, no current flows from pin VREF to

the resistor ladder network.

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