SLAS191A datasheet(75/86 Pages) TI1

75 / 86 page

5–9

; receive to get back to monitor

; with ESC

WAIT

TST.B

&RXBUF

; char. in rxbuf ?

JEQ

WAIT

; no, then wait

MOV.B

&RXBUF,&TXDATA

; put char to TXDATA

CLR.B

&RXBUF

;

BIC

#01h,&200h

; use only if no special

; treatment of ESC is wanted

CALL

&TXCHAR

; call transmit sub-routine in

; monitor

CALL

&PREPRX

; prepare software UART for

; receive to get back to monitor

; with ESC

JMP

WAIT

UART

&INT_RXTX

.sect “Int_Vect”,03E0h

; 050Eh 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

The next example receives a string with a maximum of 100 (100=64h) characters, stores them, and then

transmits them after the <ENTER> key is pressed.

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

.equ 0dh

.data 0300h

STRING:

.space

0064h

; reserves receive buffer

.text

00240H

RESET:

MOV

#03DEh,SP

; #05DEh on the MSP430X33x

MOV

#(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer

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