ATMEGA6490A-AU Atmel, ATMEGA6490A-AU Datasheet - Page 33

• Manufacturer Part Number: ATMEGA6490A-AU
• Description: IC MCU AVR 64K FLASH 100TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA6490A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 69
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10. Errata
10.1
10.2
10.3
10.4
10.5
8284AS–AVR–10/10
ATmega169A
ATmega169A/169PA Rev. A to F
ATmega169PA Rev. G
ATmega329A/329PA rev. A
ATmega329A/329PA rev. B
No known errata
Not sampled.
No known errata.
•
•
1. Interrupts may be lost when writing the timer registers in the asynchronous timer
2. Using BOD disable will make the chip reset
•
1. Interrupts may be lost when writing the timer registers in the asynchronous timer
Interrupts may be lost when writing the timer registers in the asynchronous timer
Using BOD disable will make the chip reset
Interrupts may be lost when writing the timer registers in the asynchronous timer
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
The interrupt will be lost if a timer register that is synchronous timer clock is written when the
asynchronous Timer/Counter register (TCNTx) is 0x00.
Problem Fix/ Workaround
Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor
0x00 before writing to the asynchronous Timer Control Register (TCCRx), asynchronous
Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx).
If the part enters sleep with the BOD turned off with the BOD disable option
enabled, a BOD reset will be generated at wakeup and the chip will reset.
Problem Fix/Workaround
Do not use BOD disable
The interrupt will be lost if a timer register that is synchronous timer clock is written when the
asynchronous Timer/Counter register (TCNTx) is 0x00.
Problem Fix/ Workaround
Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor
0x00 before writing to the asynchronous Timer Control Register (TCCRx), asynchronous
Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx).
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