Given that the address pins XA[19:23] of the ML674000 MCU are the secondary function of PIOA pins, how can I boot from a memory that needs to use these address pins?
Descriptive Answer:
As stated, the XA[19:23] address pins of ML674000 are the secondary function of PIOs. On reset, the corresponding PIOA pins are configured as input ports and thus the level of these pins is undetermined. To avoid any issues, an external mechanism for fixing these pins should be used during startup. A typical method of achieving this is by using pull down resistors on XA[19:23].
