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XC164CM System Units (Vol. 1 of 2) General System Control Functions Field Bits Type Description PASSWORD [7:0] rh Current Security Control Password Default after reset = 00H SCUSLC Sec. Level Command Reg. 15 14 13 12 11 ESFR (F0C0H/60H) 10 9 8 7 6 Reset Value: 0000H 5 4 3 2 1 0 COMMAND rw Field Bits Type Description COMMAND [15:0] rw Security Level Control Command The commands to control the security level must be written to this register (see Table 6-7) Note: Register SCUSLC is not protected by the security mechanism. This is required to be able to change the security level in any state. Table 6-7 Commands for Security Level Control Command Definition Note Command0 AAAAH – Command1 5554H – Command2 96H || <inverse password> – Command3 000B || <new level> || 000B || <new password> – Command4 8EH || <inverse password> Secured mode only Note: It is recommended to lock all command sequences with an atomic sequence. User’s Manual SCU_X41, V2.2 6-40 V1.2, 2006-03
