7906 datasheet(297/531 Pages) RENESAS

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A-D CONVERTER

7906 Group User’s Manual Rev.2.0

12-2

12.1 Overview

The A-D conversion is performed in the 8-bit resolution mode or the 10-bit resolution mode. Also, the input

voltage can be compared with the set value by using the A-D converter (in other words, the comparator

function). Whether to perform the A-D conversion or comparison can be selected for each pin.

❈ In chapter 12, the operations common to the A-D converter’s functions (8-bit resolution, 10-bit resolution,

comparator) are simply referred to as “operation.”

Table 12.1.1 lists the performance specifications of the A-D converter.

Table 12.1.1 Performance specifications of A-D converter

Item

Performance specifications

A-D conversion method

Successive approximation conversion method

Resolution

Either of 8-bit or 10-bit resolution can be selected by software.

Absolute accuracy

8-bit resolution mode

: ±2 LSB

10-bit resolution mode

: ±3 LSB

Analog input pin (Note)

5 pins (AN0 to AN4)

Conversion rate per analog input pin

8-bit resolution mode

: 49

φAD cycles

10-bit resolution mode

: 59

φAD cycles

φAD : A-D converter’s operation clock

Note: For each of analog input pin ANi (i = 0 to 4), whether to use pin ANi as an input pin of the A-D converter or as that

of the comparator can be selected by using the comparator function select register 0 (address DC16).

(1) 8-bit resolution mode

The input voltage from pin ANi (i = 0 to 4) is A-D converted, and the 8-bit A-D conversion result is

stored in A-D register i. (Refer to sections “12.3 A-D conversion method” and “12.5 Comparison

voltage in 8-bit resolution mode.”)

(2) 10-bit resolution mode

The input voltage from pin ANi is A-D converted, and the 10-bit A-D conversion result is stored in

A-D register i. (Refer to section “12.3 A-D conversion method.”)

(3) Comparator function

The 8-bit value which has been set in A-D register i is compared with the voltage input from pin ANi;

and then, the result of comparison is stored into the ANi pin comparator result bit. (Refer to section

“12.6 Comparator function.”)

Comparator function Comparison operation Comparison between the set value and analog input voltage

Comparison rate per

φAD cycles

analog input pin

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