Fujitsu F2MC-8L MB89620 Series Hardware Manual page 244

n Program Example for Serial Input
l Processing description
• Inputs 8 bits of serial data from the SI1 pin of serial I/O-1, 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 SCK1 pin.
Coding example
l
DDR3
SMR1
SDR1
SIOF
SST
ILR2
INT_V
IRQ7
INT_V
;-----Main program----------------------------------------------------------------------------------------------------------------------------------------
;-----Interrupt processing routine----------------------------------------------------------------------------------------------------------------------
WARI
;---------------------------------------------------------------------------------------------------------------------------------------------------------------
MB89620 series
EQU 000DH
EQU 001CH
EQU 001DH
EQU SMR1:7
EQU SMR1:0
EQU 007DH
DSEG ABS
ORG 0FFECH
DW WARI
ENDS
CSEG
:
MOV DDR3,#00000000B
CLRI
CLRB SST
MOV ILR2,#01111111B
MOV SMR1,#01001100B
SETB SST
SETI
:
CLRB SIOF
PUSHW A
XCHW A,T
PUSHW A
MOV A,SDR1
SETB SST
:
User processing
:
POPW A
XCHW A,T
POPW A
RETI
ENDS
END
CHAPTER 10 8-BIT SERIAL I/O (SERIAL I/O-1 AND SERIAL I/O-2)
; Serial 1 mode register
; Serial 1 data register
; Define the interrupt request flag bit.
; Define the serial I/O transfer start bit.
; Address of the interrupt level setting register 2
; [DATA SEGMENT]
; Set interrupt vector.
; [CODE SEGMENT]
; Stack pointer (SP) etc. are already initialized.
; Set P31/SCK1 and P33/SI1 pin as an input.
; Disable interrupts.
; Stop serial I/O transfer.
; Set interrupt level (level 1).
; Clear interrupt request flag, enable interrupt request output,
set shift clock input (SCK1), disable serial data output (SO1),
select the external shift clock, LSB first.
; Enable serial I/O transfer.
; Enable interrupts.
; Clear interrupt request flag.
; Read transfer data.
; Enable serial I/O transfer.
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