inc.b R15
MOV .b R12,0(R15) ; Low nibble segments c & d to LCD
rra.w R12
inc.b R15
MOV .b R12,0(R15) ; Low nibble segments e & f to LCD
rra.w R12
inc.b R15
MOV .b R12,0(R15) ; Low nibble segments g & h to LCD
rra.w R12
inc.b R15
MOV .b LCD_Tab(R13),R12 ; High nibble to LCD digit 2
MOV .b R12,0(R15) ; High nibble segments a & b to LCD
rra.w R12
inc.b R15
MOV .b R12,0(R15) ; High nibble segments c & d to LCD
rra.w R12
inc.b R15
MOV .b R12,0(R15) ; High nibble segments e & f to LCD
rra.w R12
inc.b R15
MOV .b R12,0(R15) ; High nibble segments g & h to LCD
rra.w R12
ret
;******************************************************************************
; LCD Type Definition
;******************************************************************************
;Segments definition
a equ 001h
b equ 010h
c equ 002h
d equ 020h
e equ 004h
f equ 040h
g equ 008h
h equ 080h
Blank equ 000h
LCD_Tab db a+b+c+d+e+f ; Displays "0"
db b+c ; Displays "1"
db a+b+d+e+g ; Displays "2"
db a+b+c+d+g ; Displays "3"
db b+c+f+g ; Displays "4"
db a+c+d+f+g ; Displays "5"
db a+c+d+e+f+g ; Displays "6"
db a+b+c ; Displays "7"
db a+b+c+d+e+f+g ; Displays "8"
db a+b+c+d+f+g ; Displays "9"
db a+b+c+e+f+g ; Displays "A"
db Blank ; Displays Blank
db a+d+e+f ; Displays "C"
db b+c+d+e+g ; Displays "D" d
db a+d+e+f+g ; Displays "E"
db a+e+f+g ; Displays "F"
;******************************************************************************
Delay; SOFtware delay
;******************************************************************************
push #0FFFFh ; Delay to TOS
DL1 dec.w 0(SP) ; Decrement TOS
jnz DL1 ; Delay over?
incd SP ; Clean TOS
ret ; Return from subroutine
;******************************************************************************
Math_calc; calculation subroutine
;******************************************************************************
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本文关键字：超声波 MSP430单片机，单片机-工控设备 - MSP430单片机
