Rainbow-electronics ATmega32L Manual de usuario descargar pdf (Pagina 237)

237

ATmega32(L)

2503C–AVR–10/02

ATmega32 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. ATmega32 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

1 2 ... 232 233 234 235 236 237 238 239 240 241 242 ... 312 313

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