AT89S8253 4MHZ 0x1E 0x73 0xFF 2 5 1 0 12288 2048 64 32 9 15 50 9 9 100 0x21000000 3 0xac010000 1 0x24000000 3 0xace30000 1 0x000a 0x1f LB1 Lockbit LB2 Lockbit LB3 Lockbit 4 CrystalEn Select Clock Source 1 UserPrgDis Select Clock Source 1 X2 clkDis Select Clock Source 1 SPIEN >Enable Serial programming and Data Downloading 1 0