Fujitsu F2MC-8L F202RA Hardware Manual page 354

CHAPTER 14 8-BIT SERIAL I/O
;--------------------Interrupt processing routine-----------------------------------------------------------
WARI
; --------------------------------------------------------------------------------------------------------------------
338
MOV SMR,#01001100B ; Clears the interrupt request flag, allows the interrupt
MOV SSEL,#00000001B ; Selects the 8-bit serial I/O.
SETB SST
SETI
:
CLRB SIOF
PUSHW A
XCHW A,T
PUSHW A
MOV A,SDR
SETB SST
:
User processing
:
POPW A
XCHW A,T
POPW A
RETI
ENDS
END
request output, sets shift clock input (SCK), prohibits
serial data output (SO), selects the external shift clock,
and sets LSB first.
; Allows serial I/O transfer.
; Enables interrupts.
; Clears the interrupt request flag.
; Reads transfer data.
; Allows serial I/O transfer.