M39208 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M39208' PDF : 30 Pages View PDF
M39208
Table 5. Device Identifiers
Identifier
EF EE
G
W A0 A1 A6 A9
Read the
Manufacturer
Identifier
VIL
VIH
VIL
VIH
VIL
VIL
VIL
VID
Read the Flash
Block Identifier
VIL
VIH
VIL
VIH
VIH
VIL
VIL
VID
Read the
EEPROM Block
VIH
VIL
VIL
VIH
X
Identifier
Note: X = Don’t Care.
X
VIL
VID
Other
Addresses
DQ0 - DQ7
Don’t Care
20h
Don’t Care
Don’t Care
t.b.d.
64 bytes
user
defined
POWER SUPPLY and CURRENT CONSUMP-
TION
EEPROM Power Down. The M39208 can be set
with the EEPROM in power down with the help of
the EEPROM power down instruction (see Table
4). Once the EEPROM power down instruction is
decoded, the EEPROM block cannot be accessed
unless a further Return instruction is decoded.
Deep Power Down. The M39208 can be set in the
lowest ICC consumption mode with the help of the
Deep Power Down instruction (see Table 4). Once
the instruction is decoded, the device is set in a
sleep mode until a Reset instruction is decoded.
Power Up. The M39208 internal logic is reset upon
a power-up condition to Read memory status. Any
Write operation in EEPROM is inhibited during the
first 5 ms following the power-up.
Either EF, EE or W must be tied to VIH during
Power-up for the maximum security of the data
contents and to remove the possibility of a byte
being written on the first rising edge of EF, EE or
W. Any write cycle initiation is locked when Vcc is
below VLKO.
READ
Read operations and instructions can be used to:
– read the contents of the Memory Array (Flash
block and EEPROM block)
– read the Memory Array (Flash block and
EEPROM block) status and identifiers.
Read data (Flash and EEPROM blocks)
Both Chip Enable EF (or EE) and Output Enable
(G) must be low in order to read the data from the
memory.
Read the Manufacturer Identifier
The manufacturer’s identifier can be read with two
methods: a Read operation or a Read instruction.
Read Operation. The manufacturer’s identifier can
be read with a Read operation with specific logic
levels applied on A0, A1, A6 and the VID level (VID
= 12V + 0.5V) on A9 (see Table 5).
Read Instruction. The manufacturer’s identifier
can also be read with a single instruction composed
of 4 operations: 3 specific Write operations (see
Table 4) and a Read which outputs the Manufac-
turer identifier, the Flash block identifier or the Flash
sector protection status.
Read the Flash Block Identifier
The Flash block identifier can be read with two
methods: a Read operation or a Read instruction.
Read Operation. The Flash block identifier (t.b.d.)
can be read with a single Read operation with
specific logic levels applied on A0, A1, A6 and the
VID level on A9 (see Table 5).
Read Instruction. The Flash block identifier can
also be read with an instruction composed of 4
operations: 3 specific Write operations and a Read
(see Table 4).
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