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PC48F4400P0U00 数据表(PDF) 77 Page - Numonyx B.V |
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PC48F4400P0U00 数据表(HTML) 77 Page - Numonyx B.V |
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77 / 102 page  November 2007 Datasheet Order Number: 290701-18 77 Numonyx™ Wireless Flash Memory (W18) 13.3 VPP Protection The Numonyx™ Wireless Flash Memory (W18) provides in-system program and erase at VPP1. For factory programming, it also includes a low-cost, backward-compatible 12 V programming feature.(Section 11.2, “Factory Programming” on page 60) The EFP feature can also be used to greatly improve factory program performance as explained in Section 11.3, “Enhanced Factory Program (EFP)” on page 61. In addition to the flexible block locking, holding the VPP programming voltage low can provide absolute hardware write protection of all flash-device blocks. If VPP is below VPPLK, program or erase operations result in an error displayed in SR[3]. (See Figure 35.) Note: If the VCC supply can sink adequate current, you can use an appropriately valued resistor. Figure 34: Protection Register Locking 0x84 0x88 0x85 0x81 0x80 PR Lock Register 0 User-Programmable Intel Factory-Programmed 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Figure 35: Examples of VPP Power Supply Configurations • 12 V fast programming • Absolute write protection with V PP ≤ VPPLK System supply (Note 1) VCC VPP 12 V supply • Low voltage and 12 V fast programming System supply 12 V supply • Low-voltage programming • Absolute write protection via logic signal System supply Prot# (logic signal) • Low-voltage programming System supply ≤ 10K Ω VCC VPP VCC VPP VCC VPP |
类似零件编号 - PC48F4400P0U00 |
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类似说明 - PC48F4400P0U00 |
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