ATmega1284P datasheet(272/380 Pages) ATMEL

tên linh kiện	ATmega1284P

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

PDF	380 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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272

8059D–AVR–11/09

ATmega1284P

23.6

ATmega1284P Boundary-scan Order

Table 23-1 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 and Port K 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 regard-

less of which physical pin they are connected to. In Figure 23-3, PXn. Data corresponds to FF0,

PXn. Control corresponds to FF1, PXn. 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 23-1.

ATmega1284P Boundary-scan Order

Bit Number

Signal Name

Module

PB0.Data

Port B

PB0.Control

PB1.Data

PB1.Control

PB2.Data

PB2.Control

PB3.Data

PB3.Control

PB4.Data

PB4.Control

PB5.Data

PB5.Control

PB6.Data

PB6.Control

PB7.Data

PB7.Control

RSTT

Reset Logic (Observe Only)

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