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exit from power down mode

Question asked by Bert van den Berg on Nov 24, 2016



Using P89V51RB2 and DS1337 Real Time Clock chip.  Am able to program DS1337 with date/time and set alarm. Put P89V51RB2 into power down mode and set to wake up on active low INT0.  The DS1337 lowers the INT0 line as programmed when alarm time reached but the P89V51RB2 does not exit power-down.   If I lower INT0 before the P89V51 goes into power-down mode the INT0 interrupt works.


Anyone know what to do to get P89V51RB out of power down mode when INT0 asserted?




Bert van den Berg