ATmega3290P datasheet(263/385 Pages) ATMEL

Part #	ATmega3290P

Description	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	385 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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263 / 385 page

263

8021E–AVR–07/09

ATmega329P/3290P

24.6

ATmega329P/3290P Boundary-scan Order

Table 24-6 and Table 24-7 shows the Scan order between TDI and TDO when the Boundary-

scan chain is selected as data path. Bit 0 is the LSB; the first bit scanned in, and the first bit

scanned out. The scan order follows the pin-out order as far as possible. Therefore, the bits of

Port A is scanned in the opposite bit order of the other ports. Exceptions from the rules are the

Scan chains for the analog circuits, which constitute the most significant bits of the scan chain

regardless of which physical pin they are connected to. In Figure 24-2, PXn. Data corresponds

to FF0, PXn. Control corresponds to FF1, and PXn. Pull-up_enable corresponds to FF2. Bit 4, 5,

6 and 7 of Port F is not in the scan chain, since these pins constitute the TAP pins when the

JTAG is enabled.

Table 24-6.

ATmega329P/649P Boundary-scan Order, 64-pin

Bit Number

Signal Name

Module

197

AC_IDLE

Comparator

196

ACO

195

ACME

194

AINBG

ATmega3290P Datasheet(PDF) 263 Page - ATMEL Corporation