Rainbow-electronics Atmega169L Bedienungsanleitung PDF herunterladen (Seite 239)

100

101

239

ATmega169V/L

2514A–AVR–08/02

Scanning the Analog

Comparator

The relevant Comparator signals regarding Boundary-scan are shown in Figure 112.

The Boundary-scan cell from Figure 113 is attached to each of these signals. The sig-

nals are described in Table 104.

The Comparator need not be used for pure connectivity testing, since all analog inputs

are shared with a digital port pin as well.

Figure 112. Analog Comparator

Figure 113. General Boundary-scan cell Used for Signals for Comparator and ADC

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

AC_IDLE

ACO

ADCEN

ACD

DQ DQ

From

Cell

ClockDR UpdateDR

ShiftDR

Cell EXTEST

To Analog Circuitry/

To Digital Logic

From Digital Logic/

From Analog Ciruitry

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