ATmega16U4 datasheet(328/408 Pages) ATMEL

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328

7766D–AVR–01/09

ATmega16U4/ATmega32U4

26.7

ATmega16U4/ATmega32U4 Boundary-scan Order

Table 26-3 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 F 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 26-3, 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. The USB pads are not included in

the boundary-scan.

Table 26-3.

ATmega16U4/ATmega32U4 Boundary-scan Order

Bit Number

Signal Name

Module

PE6.Data

Port E

PE6.Control

PE7.Data

PE7.Control

PE3.Data

PE3.Control

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

PE4.Data

PORTE

PE4.Control

PE5.Data

PE5.Control

ATmega16U4 Datasheet(PDF) 328 Page - ATMEL Corporation

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