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データシートサーチシステム |
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SLAS191A データシート(PDF) 74 Page - Texas Instruments |
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SLAS191A データシート(HTML) 74 Page - Texas Instruments |
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74 / 86 page  5–8 ; receive to get back to monitor ; with ESC MOV #00h,&03DEh ; prepare software UART only for ; use in the ROM-Monitor (&05DEh on the MSP430X33 ENDL JMP ENDL UART BR &INT_RXTX .sect “Int_Vect”,03E0h ; 05E0h on the MSP430X33x .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .word UART ; UART Routine .word RESET ; Reset .word RESET ; Reset .word RESET ; Reset .end 5.6 Receiving a Character A character received using the RS232 interface is written from the INT_RXTX interrupt routine into memory location 210h. After performing a reset, this memory location contains zeros. Each byte (not equal to zero) received is stored in memory location 210h. The content of memory location 210h is checked to determine whether or not a byte has been received. After reading the byte, this location must be cleared. The next-received character will overwrite memory location 210h with a new byte. The following code is an example of receiving a character and transmitting the same character back. WDTCTL .equ 0120h WDTHold .equ 80h WDT_wrkey .equ 05a00h TXCHAR .equ 0FFD2h TXTABLE .equ 0FFD4h PREPRX .equ 0FFD6h PREPTX .equ 0FFD8h INT_RXTX .equ 0FFDAh TXDATA .equ 020Eh RXBUF .equ 0210h .text 0240h RESET MOV #03DEh,SP ; #05DEh on the MSP430X33x MOV #(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer EINT ; enable interrupt RX MOV #0AA55h,&03DEh ; select user interrupt vector ; table (&05DEh on MSP430X33x) CALL &PREPRX ; prepare software UART for |
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