ATMEGA323L-4AI Atmel, ATMEGA323L-4AI Datasheet - Page 78
![IC AVR MCU 32K LV 4MZ IND 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323L-4AI
Manufacturer Part Number
ATMEGA323L-4AI
Description
IC AVR MCU 32K LV 4MZ IND 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323L-4AI
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K 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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA323L4AI
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Frame Formats
78
ATmega323(L)
Figure 47. Synchronous Mode XCK Timing
The UCPOL bit UCRSC selects which XCK clock edge is used for data sampling and
which is used for data change. As Figure 47 shows, when UCPOL is zero the data will
be changed at falling XCK edge and sampled at rising XCK edge. If UCPOL is set, the
data will be changed at rising XCK edge and sampled at falling XCK edge.
A serial frame is defined to be one character of data bits with synchronization bits (start
and stop bits), and optionally a parity bit for error checking. The USART accept all 30
combinations of the following as valid frame formats:
•
•
•
•
A frame starts with the start bit followed by the least significant data bit. Then the next
data bits, up to a total of nine, are succeeding, ending with the most significant bit. If
enabled, the parity bit is inserted after the data bits, before the stop bits. When a com-
plete frame is transmitted, it can be directly followed by a new frame, or the
communication line can be set to a idle (high) state. Figure 48 illustrates the possible
combinations of the frame formats. Bits inside brackets are optional.
Figure 48. Frame Formats
St
(n)
P
Sp
IDLE
UCPOL = 0
UCPOL = 1
1 start bit
5, 6, 7, 8, or 9 data bits
no, even, or odd parity bit
1 or 2 stop bits
(IDLE)
Start bit, always low.
Data bits (0 to 8).
Parity bit. Can be odd or even.
Stop bit, always high.
No transfers on the communication line (RxD or TxD).
An IDLE line must be high.
RxD / TxD
RxD / TxD
St
XCK
XCK
0
1
2
3
4
FRAME
[5]
[6]
[7]
[8]
[P]
Sample
Sample
Sp1 [Sp2]
(St / IDLE)
1457G–AVR–09/03
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