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W78LE52 Datasheet(PDF) 10 Page - Winbond |
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W78LE52 Datasheet(HTML) 10 Page - Winbond |
10 / 22 page Preliminary W78LE52 - 10 - PROGRAM/ERASE INHIBIT OPERATION This operation allows parallel erasing or programming of multiple chips with different data. When P3.6( CE ) = VIH, P3.7( OE ) = VIH, erasing or programming of non-targeted chips is inhibited. So, except for the P3.6 and P3.7 pins, the individual chips may have common inputs. COMPANY/DEVICE ID READ OPERATION This operation is supported for MTP ROM programmer to get the company ID or device ID on the W78LE52. OPERATIONS P3.0 (A9 CTRL) P3.1 (A13 CTRL) P3.2 (A14 CTRL) P3.3 (OE CTRL) P3.6 ( CE ) P3.7 ( OE ) EA (VPP) P2,P1 (A15..A0) P0 (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, others: X Data In 0FFH @4 Erase Verify 1 0 0 0 1 0 VEP Address Data Out @5 Program/Erase Inhibit X 0 0 0 1 1 VCP/ VEP X X 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 W78LE52 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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