P30
11.6
Program Protection
When VPP = VIL, absolute hardware write protection is provided for all device blocks. If
V
PP is at or 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 29: Example VPP Supply Connections
VCC
VCC
VPP
VCC
VPP
VCC
VPP
PROT #
≤ 10K Ω
• Low-voltage Programming only
• Logic Control of Device Protection
• Factory Programming with VPP = VPPH
• Complete write/Erase Protection when VPP ≤ VPPLK
VCC
VCC
VCC
VCC
VPP
VPP=VPPH
VPP
• Low Voltage Programming Only
• Full Device Protection Unavailable
• Low Voltage and Factory Programming
November 2007
Order Number: 306666-11
Datasheet
61
NUMONYX [ NUMONYX B.V ]
