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SA25C512LMNX Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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SA25C512LMNX Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 19 page SA25C512 Data Sheet SAIFUN 10 Functional Description Figure 4 presents a schematic diagram of the SPI serial interface. SI SO CS SCK SI SO CS SCK SI SO CS SCK SI SO CS SCK DATA OUT DATA IN SERIAL CLOCK SSO SS1 SS2 SS3 MASTER: MICROCONTROLLER SLAVE: SA25C512 Figure 4. SPI Serial Interface The SA25C512's SPI consists of an 8-bit instruction register that decodes a specific instruction to be executed. Six different instructions (called opcodes) are incorporated in the device for various operations. Table 5 lists the instructions set and the format for proper operation. All opcodes, array addresses and data are transferred in an MSB-first-LSB-last fashion. Detailed information about each of these opcodes is provided under individual instruction descriptions in the sections that follow. Table 5. Instruction Set Instruction Name Instruction Format Operation WREN 0000X110 Set Write Enable Latch WRDI 0000X100 Reset Write Enable Latch RDSR 0000X101 Read Status Register WRSR 0000X001 Write Status Register READ 0000X011 Read Data from Memory Array WRITE 0000X010 Write Data to Memory Array In addition to the instruction register, the device also contains an 8-bit status register that can be accessed by RDSR and WRSR instructions. The byte defines the Block Write Protection (BP1 and BP0) levels, Write Enable (WEN) status, Busy/Rdy (/RDY) status and Hardware Write Protect (WPBEN) status of the device. Table 6 illustrates the format of the status register. Table 6. Status Register Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1 Bit 0 WPBEN X X X BP1 BP0 WEN /RDY Write Enable (WREN) The device powers up in the Write Disable state when VCC is applied. All programming instructions must be preceded by a WREN instruction. Write Disable (WRDI) To protect the device against inadvertent writes, the WRDI instruction disables all programming modes. The WRDI instruction is independent of the WP pin's status. |
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