include"8515def.inc"

.dseg

keyone:.byte1

.cseg

rjmpreset

.org0x10

RESET:

ldir16,low(RAMEND);ram的顶端

ldir17,high(RAMEND)

outspl,r16;设置堆栈指针指向ram顶部

outsph,r17

ldir16,1

stskeyone,r16;变量初始化

L2:

ldsR20,keyone

ldiR24,low(L8);取散转表首地址

ldiR25,high(L8)

clrr21

subir20,1;计算表内偏移量

sbcir21,0

lslr20;注意对FLASH的地址是字寻址

rolr21

addr24,r20;相当于@a+dptr

adcr25,r21

movR30,R24

movR31,R25

ijmp;间接跳转指令,指向z=r30,31

L8:

rcallprog1

rjmpL6

rcallprog2

rjmpL6

rcallprog3

rjmpL6

rcallprog4

rjmpL6

rcallprog5

L6:

NOP

rjmpL2

ret

prog1:

ldiR24,2

stskeyone,R24

ret

prog2:

ldiR24,3

stskeyone,R24

ret

prog3:

ldiR24,4

stskeyone,R24

ret

prog4:

ldiR24,5

stskeyone,R24

ret

prog5:

ldiR24,1

stskeyone,R24

ret