atmega3250v-8auatmega325v-8ai ATMEL Corporation, atmega3250v-8auatmega325v-8ai Datasheet - Page 236

• Manufacturer Part Number: atmega3250v-8auatmega325v-8ai
• Description: Atmega3250 8-bit Microcontroller With In-system Programmable Flash
• Manufacturer: ATMEL Corporation

25.7
236
Boundary-scan Order
ATmega325/3250/645/6450
Table 25-7
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 regard-
less of which physical pin they are connected to. In
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 25-7.
Bit Number
197
196
195
194
and
ATmega325/645 Boundary-scan Order, 64-pin
Signal Name
AC_IDLE
ACO
ACME
AINBG
Table 1
shows the Scan order between TDI and TDO when the Boundary-scan
Module
Comparator
Figure
25-3, PXn. Data corresponds to FF0,
2570L–AVR–08/07