M16CSLASH29 datasheet(258/499 Pages) RENESAS

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15. A/D Converter

page 234

Item

Specification

Function

Bits SCAN1 and SCAN0 in the ADCON1 register and bits ADGSEL1 and

ADGSEL0 in the ADCON2 register select pins. Analog voltage applied to the

selected pins is repeatedly converted to a digital code

A/D Conversion Start Condition • When the TRG bit in the ADCON0 register is 0 (software trigger)

Set the ADST bit in the ADCON0 register to 1 (A/D conversion started)

• When the TRG bit in the ADCON0 register is 1 (Hardware trigger)

The ADTRG pin input changes state from “H” to “L” after setting the ADST bit

to 1 (A/D conversion started)

A/D Conversion Stop Condition Set the ADST bit to 0 (A/D conversion halted)

Interrupt Request Generation Timing None generated

Analog Input Pin

Select from AN0 to AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins),

AN0 to AN7 (8 pins) (1)

Readout of A/D Conversion Result Readout one of registers AD0 to AD7 that corresponds to the selected pin

15.1.4 Repeat Sweep Mode 0

In repeat sweep mode 0, analog voltages applied to the selected pins are repeatedly converted to a

digital code. Table 15.6 shows the repeat sweep mode 0 specifications. Figure 15.12 shows the opera-

tion example in repeat sweep mode 0. Figure 15.13 shows the ADCON0 to ADCON2 registers in repeat

sweep mode 0.

Table 15.6 Repeat Sweep Mode 0 Specifications

NOTES:

1. AN00 to AN07, AN 20 to AN27, and AN30 to AN32 can be used in the same way as AN0 to AN7.

However, all input pins need to belong to the same group.

Figure 15.12 Operation Example in Repeat Sweep Mode 0

•Example when selecting AN0 to AN3 to A/D sweep pins (SCAN1 to SCAN0 = 012)

A/D conversion started

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

A/D pin input voltage

sampling

A/D pin conversion

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