參數(shù)資料
型號(hào)： W25Q80VZPI
廠商： WINBOND ELECTRONICS CORP
元件分類： PROM
英文描述： 1M X 8 SPI BUS SERIAL EEPROM, DSO8
封裝： 6 X 5 MM, WSON-8
文件頁(yè)數(shù)： 40/60頁(yè)
文件大小： 1276K
代理商： W25Q80VZPI
W25Q80, W25Q16, W25Q32
Publication Release Date: June 20, 2007
- 45 -
Advanced - Revision A5
10.2.28 Mode Bit Reset (FFh)
For Fast Read Dual/Quad I/O operations, Mode Bits (M7-0) are implemented to further reduce
instruction overhead. By setting the Mode Bits (M7-0) to “Ax” hex, the next Fast Read Dual/Quad I/O
operation does not require the BBh/EBh instruction code (See 10.2.12 Fast Read Dual I/O and 10.2.13
Fast Read Quad I/O for detail descriptions).
If the system controller is Reset during operation it will likely send a standard SPI instruction, such
as Read ID (9Fh) or Fast Read (0Bh), to the 25Q16/32/80. However, as with most SPI Serial Flash
memories, the 25Q80/16/32 does not have a hardware Reset pin, so if Mode bits are set to “Ax”
hex, the 25Q80/16/32 will not recognize any standard SPI instructions. To address this possibility, it is
recommended to issue a Mode Bit Reset instruction “FFh” as the first instruction after a system Reset.
Doing so will release the Mode Bits for the “Ax” hex state and allow Standard SPI instructions to be
recognized. The Mode Bits Reset instruction is shown in figure 29.
Figure 29. Mode Bit Reset for Fast Read Dual/Quad I/O
IO0
/CS
CLK
IO1
Instruction (FFh)
IO2
Don’t Care
IO3
Don’t Care
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