ATmega325P datasheet(241/364 Pages) ATMEL

部件名	ATmega325P

功能描述	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	364 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

标志

241 / 364 page

241

8023F–AVR–07/09

ATmega325P/3250P

23.6

ATmega325P/3250P Boundary-scan Order

Table 23-6 and Table 23-7 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 23-2, 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 23-6.

ATmega325P Boundary-scan Order, 64-pin

Bit Number

Signal Name

Module

197

AC_IDLE

Comparator

196

ACO

195

ACME

194

AINBG

ATmega325P 数据表(PDF) 241 Page - ATMEL Corporation