STK14C88C-3
During any STORE operation, regardless of how it is initiated,
the STK14C88C-3 continues to drive the HSB pin LOW,
releasing it only when the STORE is complete. Upon completion
of the STORE operation, the nvSRAM memory access is
inhibited for tLZHSB time after HSB pin returns HIGH. Leave the
HSB unconnected if it is not used.
3. Read address 0x03E0 Valid READ
4. Read address 0x3C1F Valid READ
5. Read address 0x303F Valid READ
6. Read address 0x0C63 Initiate RECALL cycle
Internally, RECALL is a two step procedure. First, the SRAM data
is cleared. Next, the nonvolatile information is transferred into the
SRAM cells. After the tRECALL cycle time, the SRAM is again
ready for read and write operations. The RECALL operation
does not alter the data in the nonvolatile elements.
Hardware RECALL (Power-up)
During power-up or after any low power condition
(VCC< VSWITCH), an internal RECALL request is latched. When
VCC again exceeds the sense voltage of VSWITCH, a RECALL
cycle is automatically initiated and takes tHRECALL to complete.
During this time, HSB is driven low by the HSB driver.
Preventing AutoStore
The AutoStore function is disabled by initiating an AutoStore
disable sequence. A sequence of read operations is performed
in a manner similar to the Software STORE initiation. To initiate
the AutoStore disable sequence, the following sequence of CE
or OE controlled read operations must be performed:
Software STORE
Data is transferred from SRAM to the nonvolatile memory by a
software address sequence. The STK14C88C-3 Software
STORE cycle is initiated by executing sequential CE or OE
controlled read cycles from six specific address locations in
exact order. During the STORE cycle an erase of the previous
nonvolatile data is first performed, followed by a program of the
nonvolatile elements. After a STORE cycle is initiated, further
input and output are disabled until the cycle is completed.
1. Read address 0x0E38 Valid READ
2. Read address 0x31C7 Valid READ
3. Read address 0x03E0 Valid READ
4. Read address 0x3C1F Valid READ
5. Read address 0x303F Valid READ
6. Read address 0x0B45 AutoStore Disable
Because a sequence of READs from specific addresses is used
for STORE initiation, it is important that no other read or write
accesses intervene in the sequence, or the sequence is aborted
and no STORE or RECALL takes place.
The AutoStore is reenabled by initiating an AutoStore enable
sequence. A sequence of read operations is performed in a
manner similar to the Software RECALL initiation. To initiate the
AutoStore enable sequence, the following sequence of CE or OE
controlled read operations must be performed:
To initiate the Software STORE cycle, the following read
sequence must be performed:
1. Read address 0x0E38 Valid READ
2. Read address 0x31C7 Valid READ
3. Read address 0x03E0 Valid READ
4. Read address 0x3C1F Valid READ
5. Read address 0x303F Valid READ
6. Read address 0x0FC0 Initiate STORE cycle
1. Read address 0x0E38 Valid READ
2. Read address 0x31C7 Valid READ
3. Read address 0x03E0 Valid READ
4. Read address 0x3C1F Valid READ
5. Read address 0x303F Valid READ
6. Read address 0x0B46 AutoStore Enable
The software sequence may be clocked with CE controlled reads
or OE controlled reads, with WE kept HIGH for all the six READ
sequences. After the sixth address in the sequence is entered,
the STORE cycle commences and the chip is disabled. HSB is
driven LOW. After the tSTORE cycle time is fulfilled, the SRAM is
activated again for the read and write operation.
If the AutoStore function is disabled or reenabled, a manual
STORE operation (Hardware or Software) must be issued to
save the AutoStore state through subsequent power-down
cycles. The part comes from the factory with AutoStore enabled
and 0x00 written in all cells.
Data Protection
Software RECALL
The STK14C88C-3 protects data from corruption during low
voltage conditions by inhibiting all externally initiated STORE
and write operations. The low voltage condition is detected when
Data is transferred from nonvolatile memory to the SRAM by a
software address sequence. A Software RECALL cycle is
initiated with a sequence of read operations in a manner similar
to the Software STORE initiation. To initiate the RECALL cycle,
the following sequence of CE or OE controlled read operations
must be performed:
V
CC is less than VSWITCH. If the STK14C88C-3 is in a write mode
(both CE and WE are LOW) at power-up, after a RECALL or
STORE, the write is inhibited until the SRAM is enabled after
t
LZHSB (HSB to output active). This protects against inadvertent
1. Read address 0x0E38 Valid READ
2. Read address 0x31C7 Valid READ
writes during power-up or brown out conditions.
Document Number: 002-23966 Rev. *A
Page 5 of 21
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