Rainbow-electronics ATmega3290P_V Manuale Utente Scaricare il pdf (Pagina 250)

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ATmega329/3290/649/6490

2552H–AVR–11/06

Scanning the Analog

Comparator

The relevant Comparator signals regarding Boundary-scan are shown in Figure 114.

The Boundary-scan cell from Figure 115 is attached to each of these signals. The sig-

nals are described in Table 110.

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

are shared with a digital port pin as well.

Figure 114. Analog Comparator

Figure 115. 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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