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M9356-RMN6T Scheda tecnica(PDF) 7 Page - STMicroelectronics |
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M9356-RMN6T Scheda tecnica(HTML) 7 Page - STMicroelectronics |
7 / 27 page M93C86, M93C76, M93C66, M93C56, M93C46 Description 7/37 The M93Cx6 is accessed by a set of instructions, as summarized in Table 4., and in more detail in Table 5. to Table 7.). A Read Data from Memory (READ) instruction loads the address of the first byte or word to be read in an internal address register. The data at this address is then clocked out serially. The address register is automatically incremented after the data is output and, if Chip Select Input (S) is held High, the M93Cx6 can output a sequential stream of data bytes or words. In this way, the memory can be read as a data stream from eight to 16384 bits long (in the case of the M93C86), or continuously (the address counter automatically rolls over to 00h when the highest address is reached). Programming is internally self-timed (the external clock signal on Serial Clock (C) may be stopped or left running after the start of a Write cycle) and does not require an Erase cycle prior to the Write instruction. The Write instruction writes 8 or 16 bits at a time into one of the byte or word locations of the M93Cx6. After the start of the programming cycle, a Busy/Ready signal is available on Serial Data Output (Q) when Chip Select Input (S) is driven High. An internal Power-on Data Protection mechanism in the M93Cx6 inhibits the device when the supply is too low. Table 3. Memory size versus organization Device Number of bits Number of 8-bit bytes Number of 16-bit words M93C86 16384 2048 1024 M93C76 8192 1024 512 M93C66 4096 512 256 M93C56 2048 256 128 M93C46 1024 128 64 Table 4. Instruction set for the M93Cx6 Instruction Description Data READ Read Data from Memory Byte or Word WRITE Write Data to Memory Byte or Word WEN Write Enable WDS Write Disable ERASE Erase Byte or Word Byte or Word ERAL Erase All Memory WRAL Write All Memory with same Data |
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