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M93S46-W Datasheet(PDF) 10 Page - STMicroelectronics |
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M93S46-W Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 32 page Instructions M93S46-W M93S56-W M93S66-W 10/32 DocID5124 Rev 7 5 Instructions The instruction set of the M93Sx6 devices contains seven instructions, as summarized in Table 2: "Instruction set for the M93S46" and Table 3: "Instruction set for the M93S66, M93S56". Each instruction consists of the following parts, as shown in Figure 4: "READ sequence", Figure 5: "WRITE sequence" and Figure 6: "WEN and WDS sequences": • 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: "Instruction set for the M93S46"). For the M93S56 and M93S66, the address is made up of 8 bits (see Table 3: "Instruction set for the M93S66, M93S56"). 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 maximum ratings specified in Table 11: "AC Characteristics (M93Sx6-W, device grade 6)". Table 2: Instruction set for the M93S46 Instruction Description W PRE Start bit Op- code Address (1) Data Required clock cycles Additional comments READ Read Data from Memory X 0 1 10 A5-A0 Q15-Q0 - - WRITE Write Data to Memory 1 0 1 01 A5-A0 D15-D0 25 Write is executed if the address is not inside the Protected area PAWRITE Page Write to Memory 1 0 1 11 A5-A0 N x D15-D0 9 + N x 16 Write is executed if all the N addresses are not inside the Protected area WRAL Write All Memory with same Data 1 0 1 00 01 XXXX D15-D0 25 Write all data if the Protection Register is cleared WEN Write Enable 1 0 1 00 11 XXXX - 9 - WDS Write Disable X 0 1 00 00 XXXX - 9 - PRREAD Protection Register Read X 1 1 10 XXXXXX Q5-Q0 + Flag - Data Output = Protection Register content + Protection Flag bit PRWRITE Protection Register Write 1 1 1 01 A5-A0 - 9 Data above specified address A5-A0 are protected |
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