NEC PD750008 - Manual (Page 202)

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µPD750008 USER'S MANUAL
Example To output 16-bit data of BUFF1 and BUFF2 serially from bit 0 of port 3:
CLR1 MBE
MOV XA,BUFF1
MOV BSB0,XA ; Set BSB0 and BSB1
MOV XA,BUFF2
MOV BSB2,XA ; Set BSB2 and BSB3
MOV L,#0
LOOP0: SKT BSB0, @L ; Tests the specification bit of BSB
BR LOOP1
NOP ; Dummy (For timing adjustment)
SET1 PORT3. 0 ; Sets bit 0 of port 3
BR LOOP2
LOOP1: CLR1 PORT3. 0 ; Clears bit 0 of port 3
NOP ; Dummy (For timing adjustment)
NOP
LOOP2: INCS L ; L <- L + 1
BR LOOP0
RET