ATMEGA3250P-20AU Atmel, ATMEGA3250P-20AU Datasheet - Page 171
![IC MCU AVR 32K FLASH 100-TQFP](/photos/6/70/67048/313-100-tqfp_sml.jpg)
ATMEGA3250P-20AU
Manufacturer Part Number
ATMEGA3250P-20AU
Description
IC MCU AVR 32K FLASH 100-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA3250P-20AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
69
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
100-TQFP, 100-VQFP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
SPI/UART/USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
69
Number Of Timers
3
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
For Use With
ATSTK600-TQFP100 - STK600 SOCKET/ADAPTER 100-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK504 - STARTER KIT AVR EXP MOD 100P LCD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA3250P-16AU
ATMEGA3250P-16AU
ATMEGA3250P-16AU
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA3250P-20AU
Manufacturer:
AT
Quantity:
20 000
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18.6
18.6.1
8023F–AVR–07/09
Data Transmission – The USART Transmitter
Sending Frames with 5 to 8 Data Bit
The USART Transmitter is enabled by setting the Transmit Enable (TXENn) bit in the UCSRnB
Register. When the Transmitter is enabled, the normal port operation of the TxD pin is overrid-
den by the USART and given the function as the Transmitter’s serial output. The baud rate,
mode of operation and frame format must be set up once before doing any transmissions. If syn-
chronous operation is used, the clock on the XCK pin will be overridden and used as
transmission clock.
A data transmission is initiated by loading the transmit buffer with the data to be transmitted. The
CPU can load the transmit buffer by writing to the UDRn I/O location. The buffered data in the
transmit buffer will be moved to the Shift Register when the Shift Register is ready to send a new
frame. The Shift Register is loaded with new data if it is in idle state (no ongoing transmission) or
immediately after the last stop bit of the previous frame is transmitted. When the Shift Register is
loaded with new data, it will transfer one complete frame at the rate given by the Baud Register,
U2Xn bit or by XCK depending on mode of operation.
The following code examples show a simple USART transmit function based on polling of the
Data Register Empty (UDREn) Flag. When using frames with less than eight bits, the most sig-
nificant bits written to the UDRn are ignored. The USART has to be initialized before the function
can be used. For the assembly code, the data to be sent is assumed to be stored in Register
R16.
Note:
The function simply waits for the transmit buffer to be empty by checking the UDREn Flag,
before loading it with new data to be transmitted. If the Data Register Empty interrupt is utilized,
the interrupt routine writes the data into the buffer.
Assembly Code Example
C Code Example
USART_Transmit:
void USART_Transmit( unsigned char data )
{
}
; Wait for empty transmit buffer
sbis UCSR0A,UDRE0
rjmp USART_Transmit
; Put data (r16) into buffer, sends the data
out
ret
/* Wait for empty transmit buffer */
while ( !( UCSR0A & (1<<UDRE0)) )
/* Put data into buffer, sends the data */
UDR0 = data;
1.
See Section “5.” on page 10.
UDR0,r16
;
(1)
(1)
ATmega325P/3250P
171
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