NEC PD17062 - Manual (Page 118)

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PD17062
11.6.3 Notes on Interrupt Processing Routine
Note the following regarding the interrupt processing routine:
(1) Data saved by hardware
All bank registers and index enable flags are reset to 0 after being saved in the interrupt stack.
(2) Data saved by software
Data saved by software is not reset after being saved.
Program status words such as the BCD flag, compare flag, carry flag, zero flag, and memory pointer enable
flags keep their preacceptance values. Initialize these program status words if necessary.