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F25L016A-50PAIG Datasheet(PDF) 8 Page - Elite Semiconductor Memory Technology Inc. |
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F25L016A-50PAIG Datasheet(HTML) 8 Page - Elite Semiconductor Memory Technology Inc. |
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8 / 32 page  ESMT F25L016A Operation Temperature condition -40 °C~85°C Elite Semiconductor Memory Technology Inc. Publication Date: Jul. 2008 Revision: 1.2 8/32 Hold Operation HOLD pin is used to pause a serial sequence underway with the SPI flash memory without resetting the clocking sequence. To activate the HOLD mode, CE must be in active low state. The HOLD mode begins when the SCK active low state coincides with the falling edge of the HOLD signal. The HOLD mode ends when the HOLD signal’s rising edge coincides with the SCK active low state. If the falling edge of the HOLD signal does not coincide with the SCK active low state, then the device enters Hold mode when the SCK next reaches the active low state. Similarly, if the rising edge of the HOLD signal does not coincide with the SCK active low state, then the device exits in Hold mode when the SCK next reaches the active low state. See Figure 1 for Hold Condition waveform. Once the device enters Hold mode, SO will be in high impedance state while SI and SCK can be VIL or VIH. If CE is driven active high during a Hold condition, it resets the internal logic of the device. As long as HOLD signal is low, the memory remains in the Hold condition. To resume communication with the device, HOLD must be driven active high, and CE must be driven active low. See Figure 15 for Hold timing. Active Hold Active Hold Active HO LD SCK Figure 1 : HOLD CONDITION WAVEFORM Write Protection F25L016A provides software Write protection. The Write Protect pin ( WP ) enables or disables the lockdown function of the status register. The Block-Protection bits (BP1, BP0, and BPL) in the status register provide Write protection to the memory array and the status register. See Table 5 for Block-Protection description. Write Protect Pin ( WP ) The Write Protect ( WP ) pin enables the lock-down function of the BPL bit (bit 7) in the status register. When WP is driven low, the execution of the Write-Status-Register (WRSR) instruction is determined by the value of the BPL bit (see Table 3). When WP is high, the lock-down function of the BPL bit is disabled. TABLE3: CONDITIONS TO EXECUTE WRITE-STATUS- REGISTER (WRSR) INSTRUCTION WP BPL Execute WRSR Instruction L 1 Not Allowed L 0 Allowed H X Allowed |
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