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M9346-BN3T Datasheet(PDF) 5 Page - STMicroelectronics |
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M9346-BN3T Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 34 page ![]() 5/34 M93S66, M93S56, M93S46 An internal Power-on Data Protection mechanism in the M93Sx6 inhibits the device when the supply is too low. 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 cir- cuitry, 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 Table 5. to Table 6.. – 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 devices (5V range) the POR threshold voltage is around 3V. For the M93Sx6- W (3V range) and M93Sx6-R (2V range) the POR threshold voltage is around 1.5V. INSTRUCTIONS The instruction set of the M93Sx6 devices con- tains seven instructions, as summarized in Table 2. to Table 3.. Each instruction consists of the fol- lowing parts, as shown in Figure 4.: ■ 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 op-code 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 op-code). ■ The address bits of the byte or word that is to be accessed. For the M93S46, the address is made up of 6 bits (see Table 2.). For the M93S56 and M93S66, the address is made up of 8 bits (see Table 3.). The M93Sx6 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 max- imum ratings specified in Table 16. to Table 19.. |
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