HCS08QG8文档里面的: "The BDC includes one relatively simple hardware breakpoint that compares the CPU address bus to a 16-bit match value in the BDCBKPT register. This breakpoint can generate a forced breakpoint or a tagged breakpoint."
"The on-chip debug module (DBG) includes circuitry for two dditional hardware breakpoints that are more flexible than the simple reakpoint in the BDC module."