ATMEGA103-6AI Atmel, ATMEGA103-6AI Datasheet - Page 3

• Manufacturer Part Number: ATMEGA103-6AI
• Description: IC MCU 128K 6MHZ A/D IT 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA103-6AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 6MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• For Use With: ATSTK501 - ADAPTER KIT FOR 64PIN AVR MCU
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4. Read Back Value during EEPROM Polling
3. MISO Active during In-System Programming
2. The ADC Has no Free-running Mode
1. UART Loses Synchronization if RXD Line is Low when UART Receive is Disabled
1436C–09/01
When a new EEPROM byte is being programmed into the EEPROM with In-System Programming, reading the
address location being programmed will give the value P1 (see table below) until the Auto-erase is finished. Then the
value P2 will follow until programming is finished. At the time the device is ready for a new EEPROM byte, the pro-
grammed value will read correctly.
Note: This is only a problem for In-System Programmers. Reading and writing the EEPROM during normal operation is
not affected by this.
Problem Fix/Workaround
Programmers must allow both $80 and $7F as read back values if data polling is used for the EEPROM. Polling will not
work for either of the values P1 and P2, so when programming these values, the user will have to wait the prescribed
time t
During In-System Programming, the MISO line (pin 13) of the ATmega103 is active, although the UART pins are used
for programming. If pin 13 is used as an input in the application, a collision may occur on this line.
Problem Fix/Workaround
- If the MISO pin is used as an input, make sure that there is a current-limiting resistor in series with the line.
- If the pin is used as an output, make sure that whatever is connected to the line can accept that the pin is toggling
Early versions of the ATmega603/103 datasheet described an ADC Free-running mode. This mode is not available in
this device, and bit number 5 in the ADCSR register must always be written as “0”.
Problem Fix/Workaround
Use Single-conversion mode and always use the latest revision of the datasheet.
The UART will detect a UART start bit and start reception even if the UART is not enabled. If this occurs, the first byte
after re-enabling the UART will be corrupted.
Problem Fix/Workaround
Make sure that the RX line is high at start-up and when the UART is disabled. An external RS-232 level converter
keeps the line high during start-up.
Revision
F
G
J
K
L
during programming.
WD_EEPROM
before programming the next byte.
P1
$7F
$80
$80
$80
$80
ATmega103(L) Errata
P2
$7F
$7F
$7F
$7F
$7F
3