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58
S71WS-Nx0 Based MCPs
S71WS-N_01_A4 September 15, 2005
Ad van c e
Inf o rmation
Figure 11.2 PPB Program/Erase Algorithm
11.3
Dynamic Protection Bits
Dynamic Protection Bits are volatile and unique for each sector and can be individually modified.
DYBs only control the protection scheme for unprotected sectors that have their PPBs cleared
(erased to โ€œ1โ€). By issuing the DYB Set or Clear command sequences, the DYBs are set (pro-
grammed to โ€œ0โ€) or cleared (erased to โ€œ1โ€), thus placing each sector in the protected or
unprotected state respectively. This feature allows software to easily protect sectors against in-
advertent changes yet does not prevent the easy removal of protection when changes are
needed.
Read Byte Twice
Addr = SA0
Enter PPB
Command Set.
Addr = BA
Program PPB Bit.
Addr = SA
DQ5 = 1?
Yes
Yes
Yes
No
No
No
Yes
DQ6 =
Toggle?
DQ6 =
Toggle?
Read Byte.
Addr = SA
PASS
FAIL
Issue Reset
Command
Exit PPB
Command Set
DQ0 =
'1' (Erase)
'0' (Pgm.)?
Read Byte Twice
Addr = SA0
No
Wait 500 ยตs


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