Program Examples For 8-Bit Serial I/O - Fujitsu F2MC-8L MB89620 Series Hardware Manual

11
10.

Program Examples for 8-bit Serial I/O

This section gives program examples for 8-bit serial I/O.
n Program Example for Serial Output
l Processing description
• Outputs 8 bits of serial data (55H) from the SO1 pin of serial I/O-1, then generates an
interrupt when transfer is completed.
• The interrupt processing routine resets the transfer data and continues output.
• Operates as an internal shift clock and outputs the shift clock from the SCK1 pin.
• For a 10 MHz (1 instruction cycle = 4/F
32 t
Coding example
l
SMR1
SDR1
SIOF
SST
ILR2
INT_V
IRQ7
INT_V
:-----Main program----------------------------------------------------------------------------------------------------------------------------------------
;-----Interrupt processing routine----------------------------------------------------------------------------------------------------------------------
WARI
;---------------------------------------------------------------------------------------------------------------------------------------------------------------
222
CHAPTER 10 8-BIT SERIAL I/O (SERIAL I/O-1 AND SERIAL I/O-2)
the transfer speed and interrupt generation cycle are as follows:
inst
Transfer speed = 10 MHz/4/32 = 78.125 kbps
Interrupt cycle = 8 × 32 × 4/10 MHz = 102.4 µ s
EQU 001CH
EQU 001DH
EQU SMR1:7
EQU SMR1:0
EQU 007DH
DSEG ABS
ORG 0FFECH
DW WARI
ENDS
CSEG
:
CLRI
CLRB SST
MOV ILR2,#01111111B
MOV SDR1,#55H
MOV SMR1,#01111000B
SETB SST
SETI
:
CLRB SIOF
PUSHW A
XCHW A,T
PUSHW A
MOV SDR1,#55H
SETB SST
:
User processing
:
POPW A
XCHW A,T
POPW A
RETI
ENDS
END
) source oscillation (F
C C
; 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.
; Disable interrupts.
; Stop serial I/O transfer.
; Set interrupt level (level 1).
; Set transfer data (55H).
; Clear interrupt request flag, enable interrupt request output,
enable shift clock output (SCK1), enable serial data output (SO1),
select 32 t , LSB first.
inst
; Start serial I/O transfer.
; Enable interrupts.
; Clear interrupt request flag.
; Save A and T.
; Reset transfer data (55H).
; Start serial I/O transfer.
; Restore A and T.
) and the shift clock set to
MB89620 series