Fujitsu F2MC-8L Series Hardware Manual page 244

Program Example for Serial Input
Processing description
• Inputs 8 bits of serial data from the SI pin of serial I/O, then generates an interrupt when
transfer is completed.
• The interrupt processing routine reads the transferred data and continues input.
• Serial I/O uses the external shift clock. The shift clock is input from the SCK pin.
Coding example
DDR3 EQU
SMR EQU
SDR EQU
SIOF EQU
SST EQU
ILR2 EQU
INT_V DSEG
ORG
IRQ4 DW
INT_V ENDS
;-----Main program-----------------------------------------------------------------------------------------------------------------------------------------
CSEG
:
MOV
CLRI
CLRB
MOV
MOV
SETB
SETI
:
000DH
001CH ; Address of serial mode register
001DH ; Address of serial data register
SMR:7 ; Define the interrupt request flag bit.
SMR:0 ; Define the serial I/O transfer start bit.
007DH ; Address of the interrupt level setting register
ABS ; [DATA SEGMENT]
0FFF2H
WARI ; Set interrupt vector.
; [CODE SEGMENT]
; Stack pointer (SP) etc. are already initialized.
DDR3,#00000000B ; Set P30/SCK and P32/SI pin as an input.
; Disable interrupts.
SST ; Stop serial I/O transfer.
ILR2,#11111101B ; Set interrupt level (level 1).
SMR1,#01001100B ; Clear interrupt request flag, enable interrupt request output,
set shift clock input (SCK), disable serial data output (SO),
select the external shift clock, LSB first.
SST ; Enable serial I/O transfer.
; Enable interrupts.
8.11 Program Examples for 8-bit Serial I/O
217