MB91F467DA datasheet(24/137 Pages) CYPRESS

24 / 137 page

Document Number: 002-04613 Rev. *A

Page 24 of 137

MB91460D Series

6. Notes on Debugger

6.1 Execution of the RETI Command

If single-step execution is used in an environment where an interrupt occurs frequently, the corresponding interrupt handling routine

will be executed repeatedly to the exclusion of other processing. This will prevent the main routine and the handlers for low priority

level interrupts from being executed (For example, if the time-base timer interrupt is enabled, stepping over the RETI instruction will

always break on the first line of the time-base timer interrupt handler).

Disable the corresponding interrupts when the corresponding interrupt handling routine no longer needs debugging.

6.2 Break function

If the range of addresses that cause a hardware break (including event breaks) is set to the address of the current system stack pointer

or to an area that contains the stack pointer, execution will break after each instruction regardless of whether the user program actually

contains data access instructions.

To prevent this, do not set (word) access to the area containing the address of the system stack pointer as the target of the hardware

break (including an event breaks).

6.3 Operand break

It may cause malfunctions if a stack pointer exists in the area which is set as the DSU operand break. Do not set the access to the

areas containing the address of system stack pointer as a target of data event break.

MB91F467DA Datasheet(PDF) 24 Page - Cypress Semiconductor