ATmega64A datasheet(267/392 Pages) ATMEL

Part #	ATmega64A

Description	8-bit Microcontroller with 64K Bytes In-System Programmable Flash

PDF	392 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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267 / 392 page

267

8160C–AVR–07/09

ATmega64A

same clock option as to be used in the final system. The enable signals are supported in the

scan chain because the system logic can disable clock options in sleep modes, thereby dis-

connecting the Oscillator pins from the scan path if not provided. The INTCAP Fuses are not

supported in the scan-chain, so the boundary scan chain cannot make a XTAL Oscillator

requiring internal capacitors to run unless the fuse is correctly programmed.

25.5.5

Scanning the Analog Comparator

The relevant Comparator signals regarding Boundary-scan are shown in Figure 25-8. The

Boundary-scan cell from Figure 25-9 is attached to each of these signals. The signals are

described in Table 25-4.

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

shared with a digital port pin as well.

Figure 25-8. Analog Comparator

ACBG

BANDGAP

REFERENCE

ADC MULTIPLEXER

OUTPUT

ACME

AC_IDLE

ACO

ADCEN

ATmega64A Datasheet(PDF) 267 Page - ATMEL Corporation