ATMEGA103L-4AI Atmel, ATMEGA103L-4AI Datasheet - Page 68
ATMEGA103L-4AI
Manufacturer Part Number
ATMEGA103L-4AI
Description
IC MCU 128K 4MHZ A/D LV 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets
1.ATMEGA103-6AC.pdf
(141 pages)
2.ATMEGA103-6AC.pdf
(4 pages)
3.ATMEGA103L-4AC.pdf
(4 pages)
Specifications of ATMEGA103L-4AI
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
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)
2.7 V ~ 3.6 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
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Data Reception
68
ATmega103(L)
Figure 42. UART Receiver
The Receiver front-end logic samples the signal on the RXD pin at a frequency 16 times
the baud rate. While the line is idle, one single sample of logical “0” will be interpreted as
the falling edge of a start bit, and the start bit detection sequence is initiated. Let sample
1 denote the first zero-sample. Following the 1-to-0 transition, the Receiver samples the
RXD pin at samples 8, 9, and 10. If two or more of these three samples are found to be
logical “1”s, the start bit is rejected as a noise spike and the Receiver starts looking for
the next 1-to-0 transition.
If, however, a valid start bit is detected, sampling of the data bits following the start bit is
performed. These bits are also sampled at samples 8, 9 and 10. The logical value found
in at least two of the three samples is taken as the bit value. All bits are shifted into the
Transmitter Shift Register as they are sampled. Sampling of an incoming character is
shown in Figure 43.
RXD
XTAL
PIN CONTROL
GENERATOR
BAUD RATE
LOGIC
BAUD X 16
DATA RECOVERY
LOGIC
DATA BUS
REGISTER (UCR)
UART CONTROL
/16
STORE UDR
DATA BUS
BAUD
RXC
IRQ
REGISTER (USR)
REGISTER (UDR)
SHIFT REGISTER
UART STATUS
UART I/O DATA
10(11)-BIT RX
0945I–AVR–02/07
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