A. The XRSn pin can be driven
externally by a supervisor or an external pullup resistor, see the Pin
Attributes table. On-chip monitors will hold this pin low until the
supplies are in a valid range.
B. After reset from any source (see
the Reset Sources section), the boot ROM code samples Boot Mode pins.
Based on the status of the Boot Mode pin, the boot code branches to destination
memory or boot code function. If boot ROM code executes after power-on
conditions (in debugger environment), the boot code execution time is based on
the current SYSCLK speed. The SYSCLK will be based on user environment and could
be with or without PLL enabled.
Figure 6-7 Power-on
Reset
A. After reset from any source (see
the Reset Sources section), the Boot ROM code samples BOOT Mode pins.
Based on the status of the Boot Mode pin, the boot code branches to destination
memory or boot code function. If Boot ROM code executes after power-on
conditions (in debugger environment), the Boot code execution time is based on
the current SYSCLK speed. The SYSCLK will be based on user environment and could
be with or without PLL enabled.