ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 229

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ATmega325/3250/645/6450 Boundary-scan Order
2570A–AVR–09/04
Table 97 and Table 98 shows the Scan order between TDI and TDO when the Bound-
ary-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. There-
fore, 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 sig-
nificant bits of the scan chain regardless of which physical pin they are connected to. In
Figure 101, 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 97. ATmega325/645 Boundary-scan Order, 64-pin
Bit Number
197
196
195
194
193
192
191
190
189
188
187
186
185
184
183
182
181
180
179
178
177
176
175
174
173
172
171
170
Signal Name
AC_IDLE
ACO
ACME
AINBG
COMP
ACLK
PRIVATE_SIGNAL1
ADCBGEN
ADCEN
AMPEN
DAC_9
DAC_8
DAC_7
DAC_6
DAC_5
DAC_4
DAC_3
DAC_2
DAC_1
DAC_0
EXTCH
GNDEN
HOLD
MUXEN_7
MUXEN_6
MUXEN_5
ACTEN
IREFEN
(1)
ATmega325/3250/645/6450
Module
Comparator
ADC
229