LHF80V25
9
sharp
3.5 Read Identifier Codes Operation
3.6 Write
The read identifier codes operation outputs the
manufacturer code and device code (see Figure 4). Using
the manufacturer and device codes, the system CPU can
automatically match the device with its proper algorithms.
Writing commands to the CUI enable reading of device
data and identifier codes. They also control inspection and
clearing of the status register. When V =4.5V-5.5V and
CC
V
=V
, the CUI additionally controls block erasure
PP
PPH1/2
and word/byte write.
[A18-A0]
7FFFF
The Block Erase command requires appropriate command
data and an address within the block to be erased. The
Word/Byte Write command requires the command and
address of the location to be written.
Reserved for Future Implementation
The CUI does not occupy an addressable memory
location. It is written when WE# and CE# are active. The
address and data needed to execute a command are latched
on the rising edge of WE# or CE# (whichever goes high
first). Standard microprocessor write timings are used.
Figures 13 and 14 illustrate WE# and CE# controlled write
operations.
00002
00001
00000
Device Code
Manufacturer Code
4 COMMAND DEFINITIONS
Figure 4. Device Identifier Code Memory Map
When the V voltage ≤ V
, Read operations from the
PP
PPLK
status register, identifier codes, or blocks are enabled.
Placing V on V enables successful block erase
PPH1/2
PP
and word/byte write operations.
Device operations are selected by writing specific
commands into the CUI. Table 4 defines these commands.
Rev. 1.1
ETC [ ETC ]
