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SCS152-IW Datasheet(PDF) 4 Page - Microchip Technology |
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SCS152-IW Datasheet(HTML) 4 Page - Microchip Technology |
4 / 16 page SCS152 DS40150B-page 4 Preliminary © 1997 Microchip Technology Inc. 2.5 CFG Field The CFG field is further divided into four subfields: With ‘PC0 = 0’ and ‘PC1 = 1’, the device is in issuer mode; with ‘PC0 = 1’ and ‘PC1 = 0’, the device is in user mode. Some commands can only be used in issuer mode. 2.6 USER0 Field The user area can be reprogrammed to any state by the user in user mode. It also can be locked using the LOCK0 bit. In issuer mode, this field typically contains the packaging status of the device. In user mode, this field can be used for application dependent data. 2.7 UKEY0 Field In issuer mode, this field contains the transport code; in user mode, the UKEY0 field contains the key used in the signature function. The transport code is programmed during wafer probe and is completely reprogrammed during personalization to the value of the key. 3.0 COMMAND INTERFACE The SCS152 accepts the following basic commands: RESET, RDBIT/PUTBIT, BITPROG and ERASE. The extended commands are DECR-ERASE and initiate signature function. The device interprets five different SCI/SCK sequences for all its commands: a) An overlap of SCI and SCK for RESET b) A single pulse on SCK for RDBIT or PUTBIT c) A single pulse on SCI followed by a pulse on SCK for BITPROG d) A repeat of c) for ERASE e) A double pulse on SCI followed by a pulse on SCK for extended commands Normally, any one of these sequences can be followed by another; however, once the signature function has been started, a fixed sequence of commands must fol- low. The extended functions are accessed by double pulse on SCI in the correct address range. Depending on the current address, the same sequence of events on SCI and SCK will perform different functions. Name Address Description PC0 104 First bit of the issuer mode/user mode indicator PC1 105 Second bit of the issuer mode/ user mode indicator N.U. 106 Unused LOCK0 107 Unlocked status of USER0 area in user mode: ‘0’ means locked TABLE 3-1: EXTENDED FUNCTIONS Field Extended Function Accessed by Double SCI Pulse CID Test modes SER BITPROG D4…D0 DECR-ERASE CFG Test modes USER0 BITPROG UKEY0 Address 163: test mode Address 259: Initiate signature operation Other addresses perform BITPROG |
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