msp430串口数据收发的讨论（Discussion on data receiving and sending of MSP430 serial port）.docVIP

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msp430串口数据收发的讨论（Discussion on data receiving and sending of MSP430 serial port）.doc

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msp430串口数据收发的讨论（Discussion on data receiving and sending of MSP430 serial port）

msp430串口数据收发的讨论（Discussion on data receiving and sending of MSP430 serial port） Discussion on data receiving and sending of MSP430 serial port 2009-06-23 12:46:02| classification: | report | subscription name SCM In the serial communication of MSP430 16 ultra low power single chip microcomputer principle and Application Shen Jianhua edited a book in the book feel some control word is not listed, programming easy to forget to write. Unnecessary mistakes. ME2 IE2 IFG2 (or ME1 IE1 IFG1) following this procedure is used USART1. to find it three special function register usage from the.H header files. #define IE2_ (0x0001) Interrupt Enable 2 / * * / DEFC (IE2, IE2_) #define U1IE IE2 UART1 Interrupt Enable Register / * * / #define URXIE1 (0x10) #define UTXIE1 (0x20) #define IFG2_ (0x0003) Interrupt Flag 2 / * * / DEFC (IFG2, IFG2_) #define U1IFG IFG2 UART1 Interrupt Flag Register / * * / #define URXIFG1 (0x10) #define UTXIFG1 (0x20) #define ME2_ (0x0005) Module Enable 2 / * * / DEFC (ME2, ME2_) #define U1ME ME2 UART1 Module Enable Register / * * / #define URXE1 (0x10) #define UTXE1 (0x20) #define USPIE1 (0x10) Use the baud rate of 430 is very characteristic.: clock source through UTCTL0 1 SSEL1 SSEL0 UCLK1 ACLK SMCLK SMCLK external clock selection for baud rate calculation: as the clock 750KHz, baud rate 115200750000/115200=6.51 decimal 0.51*8=4.08 then UxMCTL is 0xAA or 0x55 (4 1 uniform distribution) off the baud rate =BRCLK/ (UBR+ (M7+M6+M5+M4+M3+M2+M1+M0) /8) is in turn operation. This procedure using ACLK: 32768HZ 32768/9600=3.4133... So UBR is 3 and 0.4133*8=3.3064 in the integer 3 baud rate adjustment of M7~ controller M0 any changes in the UMCTL 3 bit and can not close together. At the same time, UMCTL value of not less than 0x03 #include msp430x16x.h Void Delay (unsigned, char, m); Void ComInit (void); Unsigned char Usart_Tx_Data[30]={You, are, the, best, cheer, on...}; Void InitSystemClock (void) / / initialize the system clock { Unsigned char i; WDTCTL=WDTPW+W