ATmega64A datasheet(268/392 Pages) ATMEL

tên linh kiện	ATmega64A

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 64K Bytes In-System Programmable Flash

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268

8160C–AVR–07/09

ATmega64A

Figure 25-9. General Boundary-scan Cell used for Signals for Comparator and ADC

25.5.6

Scanning the ADC

Figure 25-10 shows a block diagram of the ADC with all relevant control and observe signals.

The Boundary-scan cell from Figure 25-6 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.

Table 25-4.

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

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

Depends upon µC code

being executed

ACBG

Input

Bandgap

Reference enable

Depends upon µC code

being executed

From

Cell

ClockDR

UpdateDR

ShiftDR

Cell

EXTEST

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