Datasheet

241
2466T–AVR–07/10
ATmega16(L)
ATmega16
Boundary-scan
Order
Table 94 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 116, 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 94. ATmega16 Boundary-scan Order
Bit Number Signal Name Module
140 AC_IDLE Comparator
139 ACO
138 ACME
137 ACBG
136 COMP ADC
135 PRIVATE_SIGNAL1
(1)
134 ACLK
133 ACTEN
132 PRIVATE_SIGNAL2
(2)
131 ADCBGEN
130 ADCEN
129 AMPEN
128 DAC_9
127 DAC_8
126 DAC_7
125 DAC_6
124 DAC_5
123 DAC_4
122 DAC_3
121 DAC_2
120 DAC_1
119 DAC_0
118 EXTCH
117 G10
116 G20
115 GNDEN
114 HOLD
113 IREFEN
112 MUXEN_7