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Keil 8051 interrupt ISR

HRX Raad

I'm having problems with 8051 based ISRs. The problem occures when:

1- Interrupt A is being serviced.
2- Interrupt B occures and is serviced (in the middle of ISR A execution.
3- Sometimes ISR A fails to complete.

I'm using the C ISRs used in C51 without any register set defined ("using xx"). My understanding is that the ISRs should get entered and serviced mutually exclusive from one another without corrupting one another's stack. Is this not the case?

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