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SLE4432 Datasheet(PDF) 11 Page - Siemens Semiconductor Group |
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SLE4432 Datasheet(HTML) 11 Page - Siemens Semiconductor Group |
11 / 35 page SLE 4432 SLE 4442 Semiconductor Group 9 SLE 4442 Additionally to the above functions the SLE 4442 provides a security code logic which controls the write/erase access to the memory. For this purpose the SLE 4442 contains a 4-byte security memory with an Error Counter EC (bit 0 to bit 2) and 3 bytes reference data. These 3 bytes as a whole are called Programmable Security Code (PSC). After power on the whole memory, except for the reference data, can only be read. Only after a successful comparison of verification data with the internal reference data the memory has the identical access functionality of the SLE 4432 until the power is switched off. After three successive unsuccessful comparisons the Error Counter blocks any subsequent attempt, and hence any possibility to write and erase. 2.2 Transmission Protocol The transmission protocol is a two wire link protocol between the interface device IFD and the integrated circuit IC. It is identical to the protocol type “S = A”. All data changes on I/O are initiated by the falling edge on CLK. The transmission protocol consists of the 4 modes: Note: The I/O pin is open drain and therefore requires an external pull up resistor to achieve a high level. – Reset and Answer-to-Reset – Command Mode – Outgoing Data Mode – Processing Mode Operational modes |
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