The following is program log file when trying to build the example in app note 138. Thanks for explanation and solution. === flash.plg (begin) === compiling Srom.c... C:\KEIL\C166\INC\REG167.H(370): error C155: 'DP8': invalid base address C:\KEIL\C166\INC\REG167.H(381): error C155: 'P8': invalid base address C:\KEIL\C166\INC\REG167.H(386): error C155: 'ODP8': invalid base address assembling Pflash.a66... Target not created === flash.plg (end) ===