7906 datasheet(303/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-8

12.2 Block description

12.2.2 A-D register i (i = 0 to 4)

Figure 12.2.4 shows the structure of the A-D register i. When the A-D conversion is completed, the conver-

sion result (contents of the successive approximation register) is stored into this register. When the comparator

function is selected, the value to be compared is stored in this register.

Each A-D register i corresponds to an analog input pin (ANi).

Fig. 12.2.4 Structure of A-D register i

Undefined

–

Bit

7 to 0

15 to 8

Function

At reset

R/W

Reads an A-D conversion result.

The value is “0” at reading.

A-D register 0 (Addresses 2116, 2016)

A-D register 1 (Addresses 2316, 2216)

A-D register 2 (Addresses 2516, 2416)

A-D register 3 (Addresses 2716, 2616)

A-D register 4 (Addresses 2916, 2816)

(b15)

(b8)

s When 8-bit resolution mode is selected

A-D register 0 (Addresses 2116, 2016)

A-D register 1 (Addresses 2316, 2216)

A-D register 2 (Addresses 2516, 2416)

A-D register 3 (Addresses 2716, 2616)

A-D register 4 (Addresses 2916, 2816)

s When 10-bit resolution mode is selected

Undefined

–

9 to 0

15 to 10

Reads an A-D conversion result.

The value is “0” at reading.

(b15)

(b8)

Bit

Function

At reset

R/W

A-D register 0 (Addresses 2116, 2016)

A-D register 1 (Addresses 2316, 2216)

A-D register 2 (Addresses 2516, 2416)

A-D register 3 (Addresses 2716, 2616)

A-D register 4 (Addresses 2916, 2816)

s When comparator function is selected

Undefined

–

7 to 0

15 to 8

Any value in the range from “0016” to “FF16” can be set.

The set value is compared with the input voltage. The value is undefined at reading.

The value is “0” at reading.

(b15)

(b8)

Bit

Function

At reset

R/W

Note: When the comparator function is selected, writing to and reading from A-D register i must be performed while the A-D

converter halts.

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