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M93C-66WBN6 Datasheet(PDF) 9 Page - STMicroelectronics |
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M93C-66WBN6 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 31 page 9/31 M93C86, M93C76, M93C66, M93C56, M93C46 Read The Read Data from Memory (READ) instruction outputs data on Serial Data Output (Q). When the instruction is received, the op-code and address are decoded, and the data from the memory is transferred to an output shift register. A dummy 0 bit is output first, followed by the 8-bit byte or 16- bit word, with the most significant bit first. Output data changes are triggered by the rising edge of Serial Clock (C). The M93Cx6 automatically incre- ments the internal address register and clocks out the next byte (or word) as long as the Chip Select Input (S) is held High. In this case, the dummy 0 bit is not output between bytes (or words) and a con- tinuous stream of data can be read. Erase/Write Enable and Disable The Erase/Write Enable (EWEN) instruction en- ables the future execution of erase or write instruc- tions, and the Erase/Write Disable (EWDS) instruction disables it. When power is first applied, the M93Cx6 initializes itself so that erase and write instructions are disabled. After an Erase/Write En- able (EWEN) instruction has been executed, eras- ing and writing remains enabled until an Erase/ Write Disable (EWDS) instruction is executed, or until VCC falls below the power-on reset threshold voltage. To protect the memory contents from ac- cidental corruption, it is advisable to issue the Erase/Write Disable (EWDS) instruction after ev- ery write cycle. The Read Data from Memory (READ) instruction is not affected by the Erase/ Write Enable (EWEN) or Erase/Write Disable (EWDS) instructions. Figure 4. READ, WRITE, EWEN, EWDS Sequences Note: For the meanings of An, Xn, Qn and Dn, see Table 5., Table 6. and Table 7.. AI00878C 1 1 0 An A0 Qn Q0 DATA OUT D S Q READ S WRITE ADDR OP CODE 1 0An A0 DATA IN D Q OP CODE Dn D0 1 BUSY READY S ERASE WRITE ENABLE 1 0Xn X0 D OP CODE 1 01 S ERASE WRITE DISABLE 1 0Xn X0 D OP CODE 0 0 0 CHECK STATUS ADDR |
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