Micron M25P40 Serial Flash Embedded Memory
Command Set Overview
Command Set Overview
All commands, addresses, and data are shifted in and out of the device, most significant
bit first.
Serial data inputs DQ0 and DQ1 are sampled on the first rising edge of serial clock (C)
after chip select (S#) is driven LOW. Then, the one-byte command code must be shifted
in to the device, most significant bit first, on DQ0 and DQ1, each bit being latched on
the rising edges of C.
Every command sequence starts with a one-byte command code. Depending on the
command, this command code might be followed by address or data bytes, by address
and data bytes, or by neither address or data bytes. For the following commands, the
shifted-in command sequence is followed by a data-out sequence. S# can be driven
HIGH after any bit of the data-out sequence is being shifted out.
• READ DATA BYTES (READ)
• READ DATA BYTES at HIGHER SPEED
• READ STATUS REGISTER
• READ IDENTIFICATION
• RELEASE from DEEP POWER-DOWN
For the following commands, S# must be driven HIGH exactly at a byte boundary. That
is, after an exact multiple of eight clock pulses following S# being driven LOW, S# must
be driven HIGH. Otherwise, the command is rejected and not executed.
• PAGE PROGRAM
• SECTOR ERASE
• BULK ERASE
• WRITE STATUS REGISTER
• WRITE ENABLE
• WRITE DISABLE
All attempts to access the memory array are ignored during a WRITE STATUS REGISTER
command cycle, a PROGRAM command cycle, or an ERASE command cycle. In addi-
tion, the internal cycle for each of these commands continues unaffected.
PDF: 09005aef8456654f
m25p40.pdf - Rev. Y 8/12 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
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