ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 270

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

ATmega64 Boundary-
scan Order
270
ATmega64(L)
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 pinout order as far as possible. Therefore, the
bits of Port A are 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
127, PXn, Data corresponds to FF0, PXn. Control corresponds to FF1, and PXn.
Pullup_enable corresponds to FF2. Bit 2, 3, 4, and 5 of Port C is not in the scan chain,
since these pins constitute the TAP pins when the JTAG is enabled.
Table 107. ATmega64 Boundary-scan Order
Bit Number
204
203
202
201
200
199
198
197
196
195
194
193
192
191
190
189
188
187
186
185
184
183
182
181
180
179
178
177
176
Signal Name
AC_IDLE
ACO
ACME
AINBG
COMP
PRIVATE_SIGNAL1
ACLK
ACTEN
PRIVATE_SIGNAL2
ADCBGEN
ADCEN
AMPEN
DAC_9
DAC_8
DAC_7
DAC_6
DAC_5
DAC_4
DAC_3
DAC_2
DAC_1
DAC_0
EXTCH
G10
G20
GNDEN
HOLD
IREFEN
MUXEN_7
(1)
(2)
Module
Comparator
ADC
2490G–AVR–03/04