ATMEGA169 ATMEL [ATMEL Corporation], ATMEGA169 Datasheet - Page 246
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ATMEGA169
Manufacturer Part Number
ATMEGA169
Description
8-bit Microcontroller with 16K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATMEGA169.pdf
(365 pages)
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ATmega169 Boundary-
scan Order
246
ATmega169/V
Table 107 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
109, PXn. Data corresponds to FF0, PXn. Control corresponds to FF1, and PXn. Pull-
up_enable corresponds to FF2. Bit 4, 5, 6, and 7of Port F is not in the scan chain, since
these pins constitute the TAP pins when the JTAG is enabled.
Table 107. ATmega169 Boundary-scan Order
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
169
Signal Name
AC_IDLE
ACO
ACME
AINBG
COMP
ACLK
ACTEN
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
IREFEN
MUXEN_7
MUXEN_6
MUXEN_5
MUXEN_4
(1)
Module
Comparator
ADC
2514P–AVR–07/06
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