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| 28F128L18 Datasheet, PDF (61/106 Pages) Numonyx B.V – StrataFlash Wireless Memory | |||
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Numonyx⢠StrataFlash® Wireless Memory (L18)
11.6
Program Protection
When VPP = VIL, absolute hardware write protection is provided for all device blocks. If
VPP is below VPPLK, programming operations halt and SR[3] is set indicating a VPP-level
error. Block lock registers are not affected by the voltage level on VPP; they may still be
programmed and read, even if VPP is less than VPPLK.
Figure 27: Example VPP Supply Connections
VCC
VPP
⤠10K Ω
VCC
VPP
VCC
PROT #
VCC
VPP
⢠Factory Programming with VPP = VPPH
⢠Complete write/Erase Protection when VPP ⤠VPPLK
⢠Low-voltage Programming only
⢠Logic Control of Device Protection
VCC
VPP=VPPH
VCC
VPP
⢠Low Voltage and Factory Programming
VCC
VCC
VPP
⢠Low Voltage Programming Only
⢠Full Device Protection Unavailable
November 2007
251902-12
Datasheet
61
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