Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 240)

240

ATmega169V/L

2514A–AVR–08/02

Scanning the ADC Figure 114 shows a block diagram of the ADC with all relevant control and observe sig-

nals. The Boundary-scan cell from Figure 110 is attached to each of these signals. The

ADC need not be used for pure connectivity testing, since all analog inputs are shared

with a digital port pin as well.

Figure 114. Analog to Digital Converter

The signals are described briefly in Table 105.

Table 104. Boundary-scan Signals for the Analog Comparator

Signal

Name

Direction as

Seen from the

Comparator Description

Recommended

Input when Not

in Use

Output Values when

Recommended

Inputs are Used

AC_IDLE input Turns off Analog

Comparator when

true

1 Depends upon µC

code being executed

ACO output Analog

Comparator Output

Will become

input to µC code

being executed

ACME input Uses output signal

from ADC mux

when true

0 Depends upon µC

code being executed

ACBG input Bandgap

Reference enable

0 Depends upon µC

code being executed

10-bit DAC +

AREF

PRECH

DACOUT

COMP

MUXEN_7

ADC_7

MUXEN_6

ADC_6

MUXEN_5

ADC_5

MUXEN_4

ADC_4

MUXEN_3

ADC_3

MUXEN_2

ADC_2

MUXEN_1

ADC_1

MUXEN_0

ADC_0

NEGSEL_2

ADC_2

NEGSEL_1

ADC_1

NEGSEL_0

ADC_0

EXTCH

10x 20x

G10

G20

ACLK

AMPEN

2.56V

ref

IREFEN

AREF

VCCREN

DAC_9..0

ADCEN

HOLD

PRECH

GNDEN

PASSEN

ACTEN

COMP

SCTEST

ADCBGEN

To Comparator

1.22V

ref

AREF

ADHSM

1 2 ... 235 236 237 238 239 240 241 242 243 244 245 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 240

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