MB91302ASLASHV301A datasheet(27/135 Pages) FUJI

27 / 135 page

MB91301 Series

❍Unique to the evaluation chip MB91V301A

• Tool reset

On an evaluation board, use the chip with INIT and TRST connected together.

• Simultaneous occurrences of a software break and a user interrupt/NMI

When a software break and a user interrupt /NMI take place at the same time, the emulator debugger can cause

the following phenomena:

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

• The halted program is not re-executed correctly.

If these phenomena occur, use a hardware break instead of the software break. If the monitor debugger has

been used, avoid setting any break at the relevant location.

• Single-stepping the RETI instruction

If an interrupt occurs frequently during single stepping, execute only the relevant processing routine repeatedly

after single-stepping RETI. This will prevent the main routine and low-interrupt-level programs from being

executed. Do not single-step the RETI instruction for avoidance purposes. When the debugging of the relevant

interrupt routine becomes unnecessary, perform debugging with that interrupt disabled.

• Operand break

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.

• ICE startup sequence

When using the ICE, when you start debugging, ensure that the bus configuration is set correctly for the area

being used before downloading. After turning on the power to the target, the states of the RD and WR0 to WR3

pins are undefined until you perform the above setting. Accordingly, include enabling pull-up as part of the startup

sequence. If using these pins as general-purpose ports, set as output ports to prevent conflict with the output

signals during the time the pin states are undefined.

* : Use as output ports.

External bus width

Pin name

32 bit

16 bit

8 bit

Pull-up

WR0

Pull-up

WR1 (P85)

Pull-up

WR2 (P86)

Pull-up

WR3 (P87)

Pull-up

MB91302A/V301A Datasheet(PDF) 27 Page - Fuji Electric