Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual do Utilizador descarregar pdf (Página 58)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

10-2

mainLoop:

call RxChar0

call TxChar0

jump mainLoop

;==============================================================================

;= TxChar0 - Outputs a character to serial port 0.

;= Inputs : Acc - Character to send.

TxChar0:

move SBUF0, Acc ; Send character

TxChar0_Loop:

move C, SCON0.1 ; Check transmit flag

sjump NC, TxChar0_Loop ; Stall until last transmit has completed

move SCON0.1, #0 ; Clear the transmit flag

ret

;==============================================================================

;= RxChar0 - Receives a character from serial port 0.

;= Outputs : Acc - Character received.

RxChar0:

move C, SCON0.0 ; Wait for receive flag to be set to 1

sjump NC, RxChar0

move Acc, SBUF0 ; Get received character

move SCON0.0, #0 ; Clear receive interrupt flag

ret

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual do Utilizador Página 58