參數(shù)資料
型號: ATTINY2313A-SUR
廠商: Atmel
文件頁數(shù): 32/172頁
文件大?。?/td> 0K
描述: MCU AVR 2KB FLASH 20MHZ 20SOIC
產(chǎn)品培訓(xùn)模塊: tinyAVR Introduction
標(biāo)準(zhǔn)包裝: 1,000
系列: AVR® ATtiny
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 18
程序存儲器容量: 2KB(1K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 128 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
其它名稱: ATTINY2313A-SUR-ND
127
8246B–AVR–09/11
ATtiny2313A/4313
14.6.1
Sending Frames with 5 to 8 Data Bit
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 UDR 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,
U2X 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 (UDRE) flag. When using frames with less than eight bits, the most signifi-
cant bits written to the UDR 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 UDRE 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(1)
USART_Transmit:
; Wait for empty transmit buffer
sbis
UCSRA,UDRE
rjmp
USART_Transmit
; Put data (r16) into buffer, sends the data
out
UDR,r16
ret
C Code Example
void
USART_Transmit( unsigned char data )
{
/* Wait for empty transmit buffer */
while
( !( UCSRA & (1<<UDRE)) )
;
/* Put data into buffer, sends the data */
UDR = data;
}
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