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CHAPTER 14 8-BIT SERIAL I/O
MOV SMR,#01001100B ; Clears the interrupt request flag, allows the interrupt
request output, sets shift clock input (SCK), prohibits
serial data output (SO), selects the external shift clock,
and sets LSB first.
MOV SSEL,#00000001B ; Selects the 8-bit serial I/O.
SETB SST ; Allows serial I/O transfer.
SETI ; Enables interrupts.
:
;--------------------Interrupt processing routine-----------------------------------------------------------
WARI CLRB SIOF ; Clears the interrupt request flag.
PUSHW A
XCHW A,T
PUSHW A
MOV A,SDR ; Reads transfer data.
SETB SST ; Allows serial I/O transfer.
:
User processing
:
POPW A
XCHW A,T
POPW A
RETI
ENDS
; --------------------------------------------------------------------------------------------------------------------
END