ATMEGA103-6AC Atmel, ATMEGA103-6AC Datasheet - Page 73

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

Specifications of ATMEGA103-6AC

• 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: 0°C ~ 70°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

Baud Rate Generator
0945I–AVR–02/07
The baud rate generator is a frequency divider that generates baud rates according to
the following equation:
•
•
•
For standard crystal frequencies, the most commonly used baud rates can be generated
by using the UBRR settings in Table 24. Observe that CPU clock frequency can be
lower than the XTAL frequency if the XTAL divider is enabled. UBRR values that yield an
actual baud rate differing less than 2% from the target baud rate are in boldface in the
table. However, using baud rates that have more than 1% error is not recommended.
High error ratings give less noise resistance.
BAUD = baud rate
f
UBRR = contents of the UART Baud Rate Register, UBRR (0 - 255)
CK
= CPU clock frequency
BAUD
=
------------------------------------- -
16 UBRR
(
f
CK
+
1
)
ATmega103(L)
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