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MIC3000BML Datasheet(PDF) 50 Page - Micrel Semiconductor |
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MIC3000BML Datasheet(HTML) 50 Page - Micrel Semiconductor |
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50 / 68 page  MIC3000 Micrel M9999-101204 50 October 2004 USER Password (USRPW) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] Read/write Read/write Read/write Read/write Read/write Read/write Read/write Read/write Default Value 0000 0000b = 00h Serial Address A2h = 1010001b Byte Address 251 = FBh USER passwords are entered in this field. This field is compared to the USRPWSET field at serial address A2h, byte 250. If the two fields match, access is allowed to the USER areas of the MIC3000 non-volatile memory at serial addresses A0h and A2h. If a valid USER password has not been entered, writes to the serial ID fields and user scratchpad areas of A0h and A2h will not be allowed and USRPWSET will be unreadable (returns all zeroes). Power-On Hours MSB (POHh) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] read-only read/write read/write read/write read/write read/write read/write read/write POH Fault Flag (POHFLT) Default Value 0000 0000b = 00h Serial Address A2h = 1010001b Byte Address 252 = FCh The lower seven bits of this register contain the most-significant bits of the 15-bit power-on hours measurement. POHFLT is an error flag. The value in this register should be combined with the Power-on Hours, Low Byte, POHl, to yield the complete result. If POHFLT is set, the power-on hour meter data has been corrupted and should be ignored. It is recommended that a two-byte (or more) sequential read operation be performed on POHh and POHl to insure coherency between the two registers. This register is non-volatile and will be maintained through power and reset cycle. Bit(s) Function Operation D[7] Power-on hours fault flag 1 = fault; 0 = no fault. D[6:0] Power-on hours, high byte Non-volatile. Power-On Hours LSB (POHl) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] read/write read/write read/write read/write read/write read/write read/write read/write POH Fault Flag (POHFLT) Default Value 0000 0000b = 00h Serial Address A2h = 1010001b Byte Address 253 = FDh This register contains the least-significant eight bits of the 15-bit power-on hours measurement. The value in this register should be combined with the Power-on Hours, High Byte, POHh, to yield the complete result. If POHFLT is set, the power-on hour meter data has been corrupted and should be ignored. It is recommended that a two-byte (or more) sequential read operation be performed on POHh and POHl to insure coherency between the two registers. This register is non-volatile and will be maintained through power and reset cycles. |
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