ACE25QC800GLMMTH datasheet(41/58 Pages) ACE

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ACE25QC800G

8M BIT SPI NOR FLASH

VER 1.2

Program and Erase Instructions

Page Program (02H)

The Page Program instruction is for programming the memory. A Write Enable instruction must previously

have been executed to set the Write Enable Latch bit before sending the Page Program instruction.

See Figure 31, the Page Program instruction is entered by driving /CS Low, followed by the instruction

code, 3-byte address and at least one data byte on SI. If the 8 least significant address bits (A7-A0) are not

all zero, all transmitted data that goes beyond the end of the current page are programmed from the start

address of the same page (from the address whose 8 least significant bits (A7-A0) are all zero). /CS must

be driven low for the entire duration of the sequence. The Page Program instruction sequence: /CS goes

low-> sending Page Program instruction ->3-byte address on SI ->at least 1 byte data on SI-> /CS goes

high.

If more than 256 bytes are sent to the device, previously latched data are discarded and the last 256 data

bytes are guaranteed to be programmed correctly within the same page. If less than 256 data bytes are

sent to device, they are correctly programmed at the requested addresses without having any effects on

the other bytes of the same page. /CS must be driven high after the eighth bit of the last data byte has been

latched in; otherwise the Page Program instruction is not executed.

As soon as /CS is driven high, the self-timed Page Program cycle (whose duration is tPP) is initiated. While

the Page Program cycle is in progress, the Status Register may be read to check the value of the Write in

Progress (WIP) bit. The Write in Progress (WIP) bit is 1 during the self-timed Page Program cycle, and is 0

when it is completed. At some unspecified time before the cycle is completed, the Write Enable Latch bit is

reset.

A Page Program instruction applied to a page which is protected by the Block Protect (BP4, BP3, BP2, BP1,

BP0) bits (see Table 5&6) is not executed.

Figure31. Page Program Sequence Diagram

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