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M93S66-125 Fiches technique(PDF) 7 Page - STMicroelectronics |
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M93S66-125 Fiches technique(HTML) 7 Page - STMicroelectronics |
7 / 28 page M93S66-125 M93S56-125 M93S46-125 Power-on data protection Doc ID 022567 Rev 1 7/28 2 Power-on data protection To prevent data corruption and inadvertent write operations during power-up, a Power-on Reset (POR) circuit resets all internal programming circuitry, and sets the device in the Write Disable mode. ● At Power-up and Power-down, the device must not be selected (that is, Chip Select Input (S) must be driven Low) until the supply voltage reaches the operating value VCC specified in Section 8: DC and AC parameters. ● When VCC reaches its valid level, the device is properly reset (in the Write Disable mode) and is ready to decode and execute incoming instructions. For the M93Sx6-125, the POR threshold voltage is around 1.5 V. 3 Instructions The instruction set of the M93Sx6-125 devices contains seven instructions, as summarized in Table 2 and Table 3. Each instruction consists of the following: ● Each instruction is preceded by a rising edge on Chip Select Input (S) with Serial Clock (C) being held Low. ● A start bit, which is the first ‘1’ read on Serial Data Input (D) during the rising edge of Serial Clock (C). ● Two opcode bits, read on Serial Data Input (D) during the rising edge of Serial Clock (C). (Some instructions also use the first two bits of the address to define the opcode). ● The address bits of the byte or word that is to be accessed. For the M93S46-125, the address is made up of 6 bits (see Table 2). For the M93S56-125 and M93S66-125, the address is made up of 8 bits (see Table 3). The M93Sx6-125 devices are fabricated in CMOS technology and are therefore able to run as slow as 0 Hz (static input signals) or as fast as the maximum ratings specified in Table 9. |
Numéro de pièce similaire - M93S66-125 |
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Description similaire - M93S66-125 |
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