Hi ,
I am writing a program to receive and transmit data from a sync modem , for that i'm using external interrupts.
For INT1_ISR i'm using reg bank 2 and for INT0_ISR i'm using reg bank 1. Main program reg bank 0 (default ) is used. I have set the SP at 50
(mov SP #50h ) in the start of the program. I'm using memory location from #30h onward for storing global data which are used in TX and RX subroutines.
For transmit and receive i have written separate subroutunes which i'm calling in ISR. Following is the part of code . I'm getting undesirable output .
Can annybody suggest whether my approach is right or wrong ?

INT1_ISR: ;TX
push psw
push a
push dpl
push dph
mov psw,#10h ;selct reg bank 2
lcall TXD
pop dph
pop dpl
pop a
pop psw
reti
TXD:
.
.
.
.
ret