W78LE812 Datasheet, PDF (14/25 Pages) Winbond – 8-BIT MTP MICROCONTROLLER

W78LE812
D7 D6 D5 D4 D3 D2 D1 D0
11011010
Company ID (#DAH)
11100000
Device ID (#E0H)
Reserved
B2 B1 B0
Security Bits
B0 : Lock bit, logic 0 : active
B1 : MOVC inhibit,
logic 0 : the MOVC instruction in external memory
cannot access the code in internal memory.
logic 1 : no restriction.
B2 : Encryption
logic 0 : the encryption logic enable
logic 1 : the encryption logic disable
Default 1 for each bit.
8KB MTP ROM
Program Memory
Reserved
0000h
1FFFh
Security Register
0FFFFh
Special Setting Registers
Lock bit
This bit is used to protect the customer's program code in the W78LE812. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
MTP ROM data and Special Setting Registers can not be accessed again.
MOVC Inhibit
This bit is used to restrict the accessible region of the MOVC instruction. It can prevent the MOVC
instruction in external program memory from reading the internal program code. When this bit is set
to logic 0, a MOVC instruction in external program memory space will be able to access code only in
the external memory, not in the internal memory. A MOVC instruction in internal program memory
space will always be able to access the ROM data in both internal and external memory. If this bit is
logic 1, there are no restrictions on the MOVC instruction.
Encryption
This bit is used to enable/disable the encryption logic for code protection. Once encryption feature is
enabled, the data presented on port 0 will be encoded via encryption logic. Only whole chip erase will
reset this bit.
+5V
+5V
A0 to A7
V IL
V IL
V IL
V IL
V IL
V IH
P1
P3.0
P3.1
P3.2
P3.3
P3.6
P3.7
X'tal1
X'tal2
Vss
V DD
P0
EA/Vpp
ALE
RST
PSEN
P2
PGM DATA
V CP
V IL
V IH
V IH
A8 to A15
A0 to A7
V IL
V IL
V IL
V IL
V IH
V IL
P1
P3.0
P3.1
P3.2
P3.3
P3.6
P3.7
X'tal1
X'tal2
Vss
V DD
P0
EA/Vpp
ALE
RST
PSEN
P2
PGM DATA
V CP
V IL
V IH
V IH
A8 to A15
Programming Configuration
Programming Verification
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