M16CSLASH29 datasheet(260/499 Pages) RENESAS

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15. A/D Converter

page 236

15.1.5 Repeat Sweep Mode 1

In repeat sweep mode 1, analog voltage is applied to the all selected pins are converted to a digital code,

with mainly used in the selected pins. Table 15.7 shows the repeat sweep mode 1 specifications. Figure

15.14

shows the operation example in repeat sweep mode 1. Figure 15.15 shows registers ADCON0 to

ADCON2 in repeat sweep mode 1.

Table 15.7 Repeat Sweep Mode 1 Specifications

Item

Specification

Function

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

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

to the all selected pins is repeatedly converted to a digital code

Example : When selecting AN0

Analog voltage is converted to a digital code in the following order

AN0

AN1

AN0

AN2

AN0

AN3, and so on.

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 Pins Mainly Select from AN0 (1 pins), AN0 to AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to

Used in A/D Conversions AN3 (4 pins) (1)

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

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 15.14 Operation Example in Repeat Sweep Mode 1

•Example when selecting AN0 to A/D sweep pins (SCAN1 to SCAN0 = 002)

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

A/D conversion started

A/D pin input voltage

sampling

A/D pin conversion

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