Log in to follow, share, and participate in this community. The following formula may be used to calculate a parallel resonant crystal's external load capacitors: CL = ((CX1 x CX2) / (CX1 + CX2)) + Cstray where: CL = the crystal load capacitance Cstray = the stray capacitance ... Yes. In case of a software reset like WD reset, BOD reset etc, the SRAM contents (memory address 0x1000 0000 to 0x1000 2000 in case of LPC1227 ) is retained. However, the part won't retain the contents if it goes to d... The LPCXpresso IDE is available for Windows, Linux and Mac OS X hosts. LPCXpresso can be downloaded from here.