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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SST25PF040B-80-4C-QAE-T 데이터시트(PDF) 8 Page - Microchip Technology |
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SST25PF040B-80-4C-QAE-T 데이터시트(HTML) 8 Page - Microchip Technology |
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8 / 31 page  SST25PF040B DS20005134B-page 8 2014 Microchip Technology Inc. 4.4.1 READ (33/25 MHZ) The Read instruction, 03H, supports up to up to 33 MHz (2.7-3.6V operation) or 25 MHz (2.3-2.7V opera- tion) Read. The device outputs the data starting from the specified address location. The data output stream is continuous through all addresses until terminated by a low to high transition on CE#. The internal address pointer will automatically increment until the highest memory address is reached. Once the highest memory address is reached, the address pointer will automati- cally increment to the beginning (wrap-around) of the address space. Once the data from address location 1FFFFFH has been read, the next output will be from address location 000000H. The Read instruction is initiated by executing an 8-bit command, 03H, followed by address bits [A23-A0]. CE# must remain active low for the duration of the Read cycle. See Figure 4-3 for the Read sequence. FIGURE 4-3: READ SEQUENCE 4.4.2 HIGH-SPEED-READ (80/50 MHZ) The High-Speed-Read instruction, supporting up to 80 MHz (2.7-3.6V operation) or 50 MHz (2.3-2.7V opera- tion) Read, is initiated by executing an 8-bit command, 0BH, followed by address bits [A23-A0] and a dummy byte. CE# must remain active low for the duration of the High-Speed-Read cycle. See Figure 4-4 for the High- Speed-Read sequence. Following a dummy cycle, the High-Speed-Read instruction outputs the data starting from the specified address location. The data output stream is continuous through all addresses until terminated by a low to high transition on CE#. The internal address pointer will automatically increment until the highest memory address is reached. Once the highest memory address is reached, the address pointer will automatically incre- ment to the beginning (wrap-around) of the address space. Once the data from address location 7FFFFH has been read, the next output will be from address location 00000H. FIGURE 4-4: HIGH-SPEED-READ SEQUENCE 25134 ReadSeq.0 CE# SO SI SCK ADD. 01 2 3 4 5 6 7 8 ADD. ADD. 03 HIGH IMPEDANCE 15 16 23 24 31 32 39 40 70 47 48 55 56 63 64 N+2 N+3 N+4 N N+1 DOUT MSB MSB MSB MODE 0 MODE 3 DOUT DOUT DOUT DOUT 25134 HSRdSeq.0 CE# SO SI SCK ADD. 012 34 5 6 7 8 ADD. ADD. 0B HIGH IMPEDANCE 15 16 23 24 31 32 39 40 47 48 55 56 63 64 N+2 N+3 N+4 N N+1 X MSB MSB MSB MODE 0 MODE 3 DOUT DOUT DOUT DOUT 80 71 72 DOUT |
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