ATmega162 datasheet(213/324 Pages) ATMEL

213 / 324 page

213

2513K–AVR–07/09

ATmega162/V

ATmega162

Boundary-scan

Order

Table 87 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 and Port E 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 regard-

less of which physical pin they are connected to. In Figure 87, PXn. Data corresponds to FF0,

PXn. Control corresponds to FF1, and PXn. Pullup_enable corresponds to FF2. Bit 4, 5, 6, and

7of Port C is not in the scan chain, since these pins constitute the TAP pins when the JTAG is

enabled.

Table 86. Boundary-scan Signals for the Analog Comparator

Signal

Name

Direction as

seen from the

Comparator

Description

Recommended

Input when Not

in Use

Output Values when

Recommended

Inputs are Used

AC_IDLE

input

Turns off Analog

comparator

when true

Depends upon µC

code being executed

ACO

output

Analog

Comparator

Output

Will become

input to µC code

being executed

ACBG

input

Bandgap

Reference

enable

Depends upon µC

code being executed

Table 87. ATmega162 Boundary-scan Order

Bit Number

Signal Name

Module

105

AC_IDLE

Comparator

104

ACO

103

ACBG

102

PB0.Data

Port B

101

PB0.Control

100

PB0.Pullup_Enable

PB1.Data

PB1.Control

PB1.Pullup_Enable

PB2.Data

PB2.Control

PB2.Pullup_Enable

PB3.Data

PB3.Control

PB3.Pullup_Enable

PB4.Data

PB4.Control

PB4.Pullup_Enable

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