W78LE51 Datasheet, PDF (11/21 Pages) Winbond – 8-BIT MTP MICROCONTROLLER

Preliminary W78LE51
Lock bit
This bit is used to protect the customer's program code in the W78LE51. 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
VIL
VIL
VIL
VIL
VIL
VIH
P1
P3.0
P3.1
P3.2
P3.3
P3.6
P3.7
X'tal1
X'tal2
Vss
VDD
P0
EA/Vpp
ALE
RST
PSEN
P2
PGM DATA
VCP
VIL
VIH
V_IH
A8 to A15
A0 to A7
VIL
VIL
VIL
VIL
VIH
VIL
P1
P3.0
P3.1
P3.2
P3.3
P3.6
P3.7
X'tal1
X'tal2
Vss
VDD
P0
EA/Vpp
ALE
RST
PSEN
P2
PGM DATA
VCP
VIL
VIH
VIH
A8 to A15
Programming Configuration
Programming Verification
ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperature
SYMBOL
VDD−VSS
VIN
TA
TST
MIN.
-0.3
VSS -0.3
0
-55
MAX.
+7.0
VDD +0.3
70
+150
UNIT
V
V
°C
°C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
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Publication Release Date: December 1998
Revision A1