ATmega165 datasheet(226/336 Pages) ATMEL

226 / 336 page

226

ATmega165/V

2573G–AVR–07/09

ATmega165 Boundary-

scan Order

Table 90 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

101, 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 90. ATmega165 Boundary-scan Order

Bit Number

Signal Name

Module

197

AC_IDLE

Comparator

196

ACO

195

ACME

194

AINBG

193

COMP

ADC

192

ACLK

191

ACTEN

190

PRIVATE_SIGNAL1(1)

189

ADCBGEN

188

ADCEN

187

AMPEN

186

DAC_9

185

DAC_8

184

DAC_7

183

DAC_6

182

DAC_5

181

DAC_4

180

DAC_3

179

DAC_2

178

DAC_1

177

DAC_0

176

EXTCH

175

GNDEN

174

HOLD

173

IREFEN

172

MUXEN_7

171

MUXEN_6

170

MUXEN_5

169

MUXEN_4

ATmega165 Datasheet(PDF) 226 Page - ATMEL Corporation

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