зʽжоƬǷжϱ׼ڿտĻζݼĴֵ ״ֵͬ ෴  

1.	0x20 = 40,  0x21=1,  0x0B=1,   0x09=1D
2.	Wait 10ms
3.	0x09=1C    ( enter standby mode)
4.	0x0B=0      (turn off set/reset)
5.	0x09=12    (self-test mode,  do set)
6.	Wait 10ms and check whether 0x09=10 (wait until selftest done)
7.	0x09=1D
8.	Read x/y/z data  ( data A )
9.	0x09=13     (self-test mode,  do reset)
10.	Wait 10ms  and check whether 0x09=10 (wait until selftest done)
11.	0x09=1D
12.	Read x/y/z data  ( data B )
