...the world's most energy friendly microcontrollers
Figure 6.2. Device Unlock
Reset
Locked
No access
150 us
APP
Program
execut ion
Unlocked
No access
APP
47 us
Cort ex
Program
execut ion
Ext ended
unlocked
No access
Ext ended APP
Cort ex
255 x 47 us
Figure 6.3. APP Expansion
swdio
swclk
app_expand
The device is unlocked by writing to the AAP_CMDKEY register and then setting the DEVICEERASE bit
of the AAP_CMD register via the debug interface. This erase operation erases the main block of flash,
all lock bits are reset and debug access through the AHB-AP is enabled. The operation takes 125 ms to
complete. Note that the SRAM contents will also be deleted during a device erase.
The debugger may read the status from the AAP_STATUS register. When the ERASEBUSY bit is set
low after DEVICEERASE of the AAP_CMD register is set, the debugger may set the SYSRESETREQ
bit in the AAP_CMD register. After reset, the debugger may resume a normal debug session through
the AHB-AP.
Note
If the debug pins are reconfigured for other I/O purposes than debug, a device erase may
no longer be executed. The pins are configured for debug in their reset state.
2012-04-24 - Giant Gecko Family - d0053_Rev0.96
28
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