SLAS191A datasheet(72/86 Pages) TI

72 / 86 page

5–6

The following code in Figure 5–3 is an example of transmission of the single character s.

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

; use #05DEh on the MSP430X33x

MOV

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

EINT

; enable interrupt

TX:

MOV

#0AA55h,&03DEh

; prepare software UART for the use

; in user application

(05DEh FOR MSP430X33x)

MOV.B

#‘a’,&TXDATA

; put char to TXDATA

;

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

MOV

#00h,&03DEh

; prepare software UART only for

; the use in the Hyperterminal

(05DEh FOR MSP430X33x)

ENDL:

JMP

ENDL

UART:

&INT_RXTX

.sect “Int_Vect”,03E0h

; (use 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

Figure 5–3. Transmitting the s Character

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