Dear all, I read from datasheet regarding OV flag. "This bit is used for signed arithmetic. It indicates an overflow of the 7-bit magnitude, which causes the sign bit to change." Is that mean whenever the MSB toggled (not include the result from bsf & bcf), this flag will be set? Thanks & regards. WH Tan -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads