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S-93C56AMFN Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-93C56AMFN Datasheet(HTML) 7 Page - Seiko Instruments Inc |
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7 / 53 page  CMOS SERIAL E 2PROM S-93C46A/56A/66A Seiko Instruments Inc. 6 n Operation Instructions (in the order of start-bit, instruction, address, and data) are latched to DI in synchronization with the rising edge of SK after CS goes high. A start-bit can only be recognized when the high of DI is latched to the rising edge of SK when CS goes from low to high, it is impossible for it to be recognized as long as DI is low, even if there are SK pulses after CS goes high. Any SK pulses input while DI is low are called "dummy clocks." Dummy clocks can be used to adjust the number of clock cycles needed by the serial IC to match those sent out by the CPU. Instruction input finishes when CS goes low, where it must be low between commands during tCDS. All input, including DI and SK signals, is ignored while CS is low, which is stand-by mode. 1. Read The READ instruction reads data from a specified address. After A0 is latched at the rising edge of SK, DO output changes from a high-impedance state (Hi-Z) to low level output. Data is continuously output in synchronization with the rise of SK. When all of the data (D0) in the specified address has been read, the data in the next address can be read with the input of another SK clock. Thus, it is possible for all of the data addresses to be read through the continuous input of SK clocks as long as CS is high. The last address (An ŸŸŸ A1 A0 = 1 ŸŸŸ 11) rolls over to the top address (An ŸŸŸ A1 A0 = 0 ŸŸŸ 00). Figure 5 Read Timing (S-93C56A) Figure 4 Read Timing (S-93C46A) A5A4A3A2A1A0+1 A5A4A3A2A1A0+2 D15 D15 D14 D14 D13 D14 Hi-Z D13 D0 D1 D2 D15 0 Hi-Z A0 A1 A2 A3 A4 A5 0 1 1 28 27 26 25 24 23 12 11 10 9 8 7 6 5 4 3 2 1 44 43 42 41 40 39 D13 D0 D1 D2 CS SK DI DO A0 A6 12 45 29 14 D15 D15 D14 D14 D13 D14 Hi-Z A6A5A4A3A2A1A0+1 D13 D0 D1 D2 D15 0 Hi-Z A1 A2 A3 A4 A5 X 0 1 1 28 27 26 25 24 11 10 9 8 7 6 5 4 3 2 1 44 43 42 41 40 A6A5A4A3A2A1A0+2 D13 D0 D1 13 CS SK DI DO |
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