參數(shù)資料
型號: PIC16F1826-I/MV
廠商: Microchip Technology
文件頁數(shù): 9/109頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 2K 28-UQFN
產(chǎn)品培訓(xùn)模塊: XLP Deep Sleep Mode
8-bit PIC® Microcontroller Portfolio
特色產(chǎn)品: Extreme Low Power (XLP) Microcontrollers
標(biāo)準(zhǔn)包裝: 91
系列: PIC® XLP™ mTouch™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 32MHz
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): 16
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-UFQFN 裸露焊盤
包裝: 托盤
產(chǎn)品目錄頁面: 655 (CN2011-ZH PDF)
166
2570N–AVR–05/11
ATmega325/3250/645/6450
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.
20.6.2
Sending Frames with 9 Data Bit
If 9-bit characters are used (UCSZ = 7), the ninth bit must be written to the TXB8n bit in
UCSRnB before the low byte of the character is written to UDRn. The following code examples
show a transmit function that handles 9-bit characters. For the assembly code, the data to be
sent is assumed to be stored in registers R17:R16.
Notes:
1. These transmit functions are written to be general functions. They can be optimized if the con-
tents of the UCSRnB is static. For example, only the TXB8n bit of the UCSRnB Register is
used after initialization.
The ninth bit can be used for indicating an address frame when using multi processor communi-
cation mode or for other protocol handling as for example synchronization.
20.6.3
Transmitter Flags and Interrupts
The USART Transmitter has two flags that indicate its state: USART Data Register Empty
(UDREn) and Transmit Complete (TXCn). Both flags can be used for generating interrupts.
Assembly Code Example
USART_Transmit:
; Wait for empty transmit buffer
sbis
UCSR0A,UDRE0
rjmp
USART_Transmit
; Copy 9th bit from r17 to TXB80
cbi
UCSR0B,TXB80
sbrc
r17,0
sbi
UCSR0B,TXB80
; Put LSB data (r16) into buffer, sends the data
out
UDR0,r16
ret
C Code Example(1)(2)
void
USART_Transmit( unsigned int data )
{
/* Wait for empty transmit buffer */
while
( !( UCSR0A & (1<<UDRE0))) )
;
/* Copy 9th bit to TXB80 */
UCSR0B &= ~(1<<TXB80);
if ( data & 0x0100 )
UCSR0B |= (1<<TXB80);
/* Put data into buffer, sends the data */
UDR0 = data;
}
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