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CAT35C804A Datasheet(PDF) 8 Page - Catalyst Semiconductor

Part # CAT35C804A
Description  4K-Bit Secure Access Serial E2PROM
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT35C804A Datasheet(HTML) 8 Page - Catalyst Semiconductor

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Preliminary
CAT35C804A
8
Doc. No. 25043-00 2/98
DEVICE OPERATION
INSTRUCTIONS
The CAT35C804A instruction set includes 19 instruc-
tions.
Six instructions are related to security or write protection:
DISAC
Disable Access
ENAC
Enable Access
MACC
Modify Access Code
OVMPR
Override Memory Pointer Register
RMPR
Read Memory Pointer Register
WMPR
Write Memory Pointer Register
Six instructions are READ/WRITE/ERASE instructions:
ERAL
Clear All Locations
ERASE
Clear Memory Locations
READ
Read Memory
RSEQ
Read Sequentially
WRAL
Write All
WRITE
Write memory
Note: All write instructions will automatically perform a clear before
writing data.
Seven instructions are used as control and status func-
tions:
DISBSY
Disable Busy
ENBSY
Enable Busy
EWEN
Program/Erase Enable
EWDS
Program/Erase Disable
NOP
No Operation
ORG
Select Memory Organization
RSR
Read Status Register
UNPROTECTED MODE
As shipped from the factory, the CAT35C804A is in the
unprotected mode. The access code length is set to 0,
and the memory pointer is at address 00 hex. While in
this mode, any portion of the E2PROM array can be read
or written to without an access code. A portion of the
memory may be protected from any write or clear
operation by setting the memory pointer to the appropri-
ate address via the WMPR (Write Memory Pointer
Register) instruction:
WMPR
[address]
Figure 8. EWEN/EWDS Timing (x8 Format)
5076 FHD F11
CS
DI
DO
OP0–OP7
OP CODE
HIGH-Z
Figure 9. EWEN/EWDS Timing (x16 Format)
CS
DI
DO
OP0–OP7
OP CODE
HIGH-Z
5076 FHD F11


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