6.5.8.3 Debug Reset

The debugger needs to perform the following actions:

After Reset, wait until the DALUN bit is cleared before accessing the core registers. Then, read DHCSR.S_RESET_ST to check if a Reset has occurred, because until DALUN is cleared, the debugger has no access to any internal address space except for the DSU’s external address space (i.e., offset 0x100–0x1FF).