烧程序验证，片内没有xRam
test_xRam:
mov LED_status, #0x02
mov dptr, #0x0000
mov r0, #0x40
mov a, #0xff
xRamIn: movx @dptr, a
inc dptr
dec a
djnz r0, xRamIn
mov r0, #0x40
inc a
mov r1, #0xff
mov dptr, #0x0000
xRamOut:movx a, @dptr
cjne a, 1, xRamError
dec r1
inc dptr
djnz r0, xRamOut
mov LED_status, #0x01
ret
xRamError:
mov LED_status, #0x00
ret
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