M16CSLASH29 datasheet(256/499 Pages) RENESAS

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15. A/D Converter

page 232

15.1.3 Single Sweep Mode

In single sweep mode, analog voltages applied to the selected pins are converted one-by-one to a digital

code. Table 15.5 shows the single sweep mode specifications. Figure 15.10 shows the operation

example in single sweep mode. Figure 15.11 shows the ADCON0 to ADCON2 registers in single sweep

mode.

Item

Specification

Function

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

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

selected pins is converted one-by-one 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 • A/D conversion completed(When selecting a software trigger, the ADST bit

is set to 0 (A/D conversion halted)).

• Set the ADST bit to 0

Interrupt Request Generation Timing A/D conversion completed

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

Table 15.5 Single Sweep Mode Specifications

NOTE:

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 15.10 Operation Example in Single Sweep Mode

A/D conversion started

A/D interrupt request generated

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

A/D pin input voltage

sampling

A/D pin conversion

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

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