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SST25VF512-20-4C-SA Datasheet(PDF) 11 Page - Silicon Storage Technology, Inc |
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SST25VF512-20-4C-SA Datasheet(HTML) 11 Page - Silicon Storage Technology, Inc |
11 / 23 page Data Sheet 512 Kbit SPI Serial Flash SST25VF512 11 ©2005 Silicon Storage Technology, Inc. S71192-08-000 11/05 Chip-Erase The Chip-Erase instruction clears all bits in the device to FFH. A Chip-Erase instruction will be ignored if any of the memory area is protected. Prior to any Write operation, the Write-Enable (WREN) instruction must be executed. CE# must remain active low for the duration of the Chip-Erase instruction sequence. The Chip-Erase instruction is initiated by executing an 8-bit command, 60H. CE# must be driven high before the instruction is executed. The user may poll the Busy bit in the software status register or wait TCE for the completion of the internal self-timed Chip-Erase cycle. See Figure 9 for the Chip-Erase sequence. FIGURE 9: CHIP-ERASE SEQUENCE Read-Status-Register (RDSR) The Read-Status-Register (RDSR) instruction allows read- ing of the status register. The status register may be read at any time even during a Write (Program/Erase) operation. When a Write operation is in progress, the Busy bit may be checked before sending any new commands to assure that the new commands are properly received by the device. CE# must be driven low before the RDSR instruction is entered and remain low until the status data is read. Read- Status-Register is continuous with ongoing clock cycles until it is terminated by a low to high transition of the CE#. See Figure 10 for the RDSR instruction sequence. FIGURE 10: READ-STATUS-REGISTER (RDSR) SEQUENCE CE# SO SI SCK 01 2 3 4 5 6 7 60 HIGH IMPEDANCE MODE 0 MODE 3 1192 F07.12 MSB 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1192 F37.7 MODE 3 SCK SI SO CE# Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 05 MODE 0 HIGH IMPEDANCE Status Register Out MSB MSB |
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