M30620FCAFP datasheet(452/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-135

(1) In 8-bit mode, 8 higher-order bits of the 10-bit successive comparison register becomes A-D

conversion result. Hence, if compared to a result obtained by using an 8-bit A-D converter,

the voltage compared is different by 3 VREF/2048 (see what are underscored in Table

2.7.12), and differences in stepping points of output codes occur as shown in Figure 2.7.24.

2.7.12 Method of A-D Conversion (8-bit mode)

Figure 2.7.24. The level conversion characteristics of 8-bit mode and 8-bit A-D converter

Comparison

voltage

Vref

8-bit mode

8-bit A-D converter

–

VREF

210

VREF

x 0.5

–

VREF

0.5

n = 0

n = 1 to 255

Table 2.7.12. The comparison voltage in 8-bit mode compared to 8-bit A-D converter

Analog input voltage (mV)

Output code

(Result of A-D conversion)

Analog input voltage (mV)

Output code

(Result of A-D conversion)

10-bit

mode

8-bit

mode

8bit-mode

10bit-mode

17.5

37.5

(Note)

Optimal conversion characteristics of 8-bit A-D converter (VREF = 5.12 V)

Optimal conversion characteristics in 8-bit mode (VREF = 5.12 V)

Note: Differences in stepping points of output code for analog input voltage.

M30620FCAFP Datasheet(PDF) 452 Page - Renesas Technology Corp

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