MB91354A 데이터 시트보기 (PDF) - Fujitsu

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MB91354A

32-Bit Proprietary Microcontroller

Fujitsu 

MB91350A Series

[Note on debugger]

• Step execution of RETI command

If an interrupt occurs frequently during single-stepping, the corresponding interrupt handling routine is executed

repeatedly. This will prevent the main routine and low-interrupt-level programs from being executed. (Whenever

RETI is single-stepped when interrupts by the timebase timer have been enabled, for example, the timebase

timer routine causes a break at the beginning.)

Disable the corresponding interrupt when the corresponding interrupt handling routine no longer needs debug-

ging.

• Break function

If the address at which to cause a hardware break (including a event break) is set to the address currently

contained in the system stack pointer or in the area containing the stack pointer, the user program causes a

break after execution of one instruction.

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

target of a hardware break (including an event break).

• Internal ROM area

Do not set an area of internal ROM as a DMAC transfer destination.

• Simultaneous occurrences of a software break (INTE instruction) and a user interrupt/NMI

When an INTE instruction and a user interrupt/NMI are accepted simultaneously, the emulator debugger reacts

as follows.

The emulator debugger stops while indicating a location in the user program, which is not a user-specified

breakpoint. (It stops with the beginning of the user interrupt/NMI handling routine indicated.)

The user program cannot be re-executed correctly.

To prevent this problem, follow the instructions below.

When a software break and a user interrupt/NMI occur simultaneously, the emulator debugger may react as

follows.

• The debugger stops pointing to a location other than the programmed breakpoints.

• The halted program is not re-executed correctly.

If this symptom occurs, use a hardware break in place of a hardware break. When using a monitor debugger,

do not set a break at the relevant location.

• A stack pointer placed in an area set for a DSU operand break can cause a malfunction. Do not apply a data

event break to access to the area containing the address of a system stack pointer.

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