3.4.1PeripheralLockRegisterDescription
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
Whenwrittenwithcorrect32bitkey(0x0F0A0B00),thePeripheralLockRegister(PERLOCK)allowsone
writetothePERCFG0registerwithin16SYSCLK3cycles.
NOTE
TheinstructionsthatwritetothePERLOCKandPERCFG0registersmustbeinthesame
fetchpacketifcodeisbeingexecutedfromexternalmemory.Iftheinstructionsarein
differentfetchpackets,fetchingthesecondinstructionfromexternalmemorymaystallthe
instructionlongenoughsuchthatPERCFG0registerwillbelockedbeforetheinstruction
isexecuted.
310
LOCKVAL
R/W-F0F0F0F0
LEGEND:R/W=Read/Write;-n=valueafterreset
Figure3-3.PeripheralLockRegister(PERLOCK)-0x02AC0004
Table3-6.PeripheralLockRegister(PERLOCK)FieldDescriptions
BitFieldValueDescription
31:0LOCKVALWhenprogrammedwith0x0F0A0B00allowsonewritetothePERCFG0registerwithin16
SYSCLK3clockcycles.
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