ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Problem Fix / Workaround

Select the Device ID Register of the ATmega64 (Either by issuing the IDCODE

instruction or by entering the Test-Logic-Reset state of the TAP controller) to read

out the contents of its Device ID Register and possibly data from succeeding

devices of the scan chain. Note that data to succeeding devices cannot be entered

during this scan, but data to preceding devices can. Issue the BYPASS instruction

to the ATmega64 to select its Bypass Register while reading the Device ID Regis-

ters of preceding devices of the boundary scan chain. Never read data from

succeeding devices in the boundary scan chain or upload data to the succeeding

devices while the Device ID Register is selected for the ATmega64. Note that the

IDCODE instruction is the default instruction selected by the Test-Logic-Reset state

of the TAP-controller.

Alternative Problem Fix / Workaround

If the Device IDs of all devices in the boundary scan chain must be captured simul-

taneously (for instance if blind interrogation is used), the boundary scan chain can

be connected in such way that the ATmega64 is the fist device in the chain. Update-

DR will still not work for the succeeding devices in the boundary scan chain as long

as IDCODE is present in the JTAG Instruction Register, but the Device ID registered

cannot be uploaded in any case.

352 ATmega64(L)

2490G–AVR–03/04

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