ATMEGA48-20AJ Atmel, ATMEGA48-20AJ Datasheet - Page 356

IC AVR MCU 4K 5V 20MHZ 32-TQFP

ATMEGA48-20AJ

Manufacturer Part Number
ATMEGA48-20AJ
Description
IC AVR MCU 4K 5V 20MHZ 32-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA48-20AJ

Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA48-24AJ
ATMEGA48-24AJ

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA48-20AJ
Manufacturer:
Atmel
Quantity:
10 000
34. Errata
34.1
34.1.1
34.1.2
34.1.3
356
Errata ATmega48
ATmega48/88/168
Rev. D
Rev. C
Rev. B
The revision letter in this section refers to the revision of the ATmega48 device.
1. Interrupts may be lost when writing the timer registers in the asynchronous timer
1.
2. Interrupts may be lost when writing the timer registers in the asynchronous timer
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
Reading EEPROM when system clock frequency is below 900 kHz may not work
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
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).
Reading EEPROM when system clock frequency is below 900 kHz may not work
Reading Data from the EEPROM at system clock frequency below 900 kHz may result in
wrong data read.
Problem Fix/Workaround
Avoid using the EEPROM at clock frequency below 900 kHz.
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).
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).
2545S–AVR–07/10

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