ATMEGA64A 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA64A

8-bit Atmel Microcontroller with64KB In-System Programmable Flash

Atmel Corporation 

NOP

; no operation

NOP

; no operation

NOP

; no operation

NOP

; no operation

NOP

; no operation

SEI

; set global interrupt enable

4. Stabilizing time needed when changing OSCCAL Register

After increasing the source clock frequency more than 2% with settings in the OSCCAL register, the

device may execute some of the subsequent instructions incorrectly.

Problem Fix/Workaround

The behavior follows errata number 3., and the same Fix / Workaround is applicable on this errata.

5. IDCODE masks data from TDI input

The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by

all-ones during Update-DR.

Problem Fix/Workaround

– If ATmega64A is the only device in the scan chain, the problem is not visible.

– Select the Device ID Register of the ATmega64A 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. Issue the BYPASS

instruction to the ATmega64A while reading the Device ID Registers of preceding devices of

the boundary scan chain.

– If the Device IDs of all devices in the boundary scan chain must be captured simultaneously,

the ATmega64A must be the first device in the chain.

6. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request.

Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR register

triggers an unexpected EEPROM interrupt request.

Problem Fix/Workaround

Always use OUT or SBI to set EERE in EECR.

Atmel ATmega64A [DATASHEET] 19

Atmel-8160ES-8-bit AVR Micrcontroller_Datasheet_Summary-09/2015

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