My MSC1213 circuit always get into programming mode after watchdog or low power reset. while it works fine with power up reset. the PSEN and ALE already keep open during reset. i can not find any description beside use PSEN and ALE control operation mode. who can help me?
more, my circuit is for ADC and DAC application, all the digital ports was set to high impedance except the AURT0. i have monitor the PSEN and ALE, they are keep high voltage until reset, and then PSEN get clk ouput. after reset, when i send a CR through AURT0, "Boot Loader Ver:180480F13" can be replied. if not trigger watchdog timeout, the system can always working.
