  The properties of $T=1/2$ mirror nuclei in the $fp$ shell have been studied
with a microscopic residual interaction. The isospin-nonconserving interaction
is derived from a high-precision charge-dependent Bonn \textit{NN} potential
using the folded-diagram renormalization method. The level structures of the
nuclei are calculated, obtaining excellent agreements with experimental
observations till the $0f_{7/2}$ band termination. The role played by isospin
symmetry breaking on ground-state displacement energies and mirror energy
differences is discussed, which may help to explain the long-standing
Nolen-Schiffer anomaly. Electromagnetic and weak transition properties are
presented, with discussions on the asymmetry in analogous transitions.
