W78LE54 Datasheet, PDF (10/22 Pages) Winbond – 8-BIT MTP MICROCONTROLLER

Preliminary W78LE54
Company/Device ID Read Operation
This operation is supported for MTP ROM programmer to get the company ID or device ID on the
W78LE54.
OPERATIONS P3.0 P3.1 P3.2 P3.3 P3.6
(A9 (A13 (A14 (OE _{( CE )}
CTRL) CTRL) CTRL) CTRL)
P3.7
( OE )
EA
(VPP)
P2,P1
P0
(A15..A0) (D7..D0)
NOTE
Read
0
0
0
0
0
0
1 Address Data Out
Output Disable 0
0
0
0
0
1
1
X
Hi-Z
Program
0
0
0
0
0
1 VCP Address Data In
Program Verify 0
0
0
0
1
0 VCP Address Data Out @3
Erase
1
0
0
0
0
1 VEP A0:0, Data In @4
others: X _0FFH
Erase Verify
1
0
0
0
1
0 VEP Address Data Out @5
Program/Erase X
0
0
0
1
1 VCP/
X
X
Inhibit
VEP
Company ID
1
0
0
0
0
0
1 A0 = 0 Data Out
Device ID
1
0
0
0
0
0
1 A0 = 1 Data Out
Notes:
1. All these operations happen in RST = VIH, ALE = VIL and PSEN = VIH.
2. VCP = 12.5V, VEP = 14.5V, VIH = VDD, VIL = Vss.
3. The program verify operation follows behind the program operation.
4. This erase operation will erase all the on-chip MTP-ROM cells and the Security bits.
5. The erase verify operation follows behind the erase operation.
SECURITY BITS
During the on-chip MTP-ROM operation mode, the MTP-ROM can be programmed and verified
repeatedly. Until the code inside the MTP-ROM is confirmed OK, the code can be protected. The
protection of MTP ROM and those operations on it are described below.
The W78LE54 has several Special Setting Registers, including the Security Register and
Company/Device ID Registers, which can not be accessed in normal mode. These registers can only
be accessed from the MTP-ROM operation mode. Those bits of the Security Registers can not be
changed once they have been programmed from high to low. They can only be reset through erase-
all operation. The contents of the Company ID and Device ID registers have been set in factory. Both
registers are addressed by the A0 address line during the same specific condition. The Security
Register is addressed in the MTP-ROM operation mode by address #0FFFFh.
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