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M93C86-WMN3TP Datasheet(PDF) 7 Page - STMicroelectronics |
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M93C86-WMN3TP Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 31 page 7/31 M93C86, M93C76, M93C66, M93C56, M93C46 INSTRUCTIONS The instruction set of the M93Cx6 devices con- tains seven instructions, as summarized in Table 5. to Table 7.. 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 M93C46, the address is made up of 6 bits for the x16 organization or 7 bits for the x8 organization (see Table 5.). For the M93C56 and M93C66, the address is made up of 8 bits for the x16 organization or 9 bits for the x8 organization (see Table 6.). For the M93C76 and M93C86, the address is made up of 10 bits for the x16 organization or 11 bits for the x8 organization (see Table 7.). The M93Cx6 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 20. to Table 23.. Table 5. Instruction Set for the M93C46 Note: 1. X = Don't Care bit. Instruc tion Description Start bit Op- Code x8 Origination (ORG = 0) x16 Origination (ORG = 1) Address(1) Data Required Clock Cycles Address(1) Data Required Clock Cycles READ Read Data from Memory 1 10 A6-A0 Q7-Q0 A5-A0 Q15-Q0 WRITE Write Data to Memory 1 01 A6-A0 D7-D0 18 A5-A0 D15-D0 25 EWEN Erase/Write Enable 1 00 11X XXXX 10 11 XXXX 9 EWDS Erase/Write Disable 1 00 00X XXXX 10 00 XXXX 9 ERASE Erase Byte or Word 1 11 A6-A0 10 A5-A0 9 ERAL Erase All Memory 1 00 10X XXXX 10 10 XXXX 9 WRAL Write All Memory with same Data 1 00 01X XXXX D7-D0 18 01 XXXX D15-D0 25 |
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