M30620FCAFP datasheet(571/615 Pages) RENESAS

571 / 615 page

Appendix 1

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-254

Appendix 1 Check Sheet

The following check sheet was created based on items which had been the source of problems in the past.

We recommend you refer to the check sheet when troubleshooting.

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Checks regarding register initial settings

Has the initial setting been made in the interrupt stack pointer (ISP) at the top of the program?

Has the initial setting been made in the user stack pointer (USP)? (Only if using the USP)

Does the USP overlap the ISP area? (Only if using the USP)

Is interrupt enabled after setting the ISP and USP?

Is the top address of the variable interrupt vector table set in the interrupt table register (INTB)?

Is interrupt enabled after setting the INTB?

Has the initial setting been made in the frame base register (FB)? (Only if using the FB)

Has the initial setting been made in the stack base register (SB)? (Only if using the SB)

Checks regarding the internal memory

Does the RAM capacity used in the program exceed the RAM capacity of the microcomputer?

Does the ROM capacity used in the program exceed the ROM capacity of the microcomputer?

Checks regarding the protect register

Is writing enabled in the protect register (address 000A16) before writing in the system clock control

Is writing enabled in the protect register before writing in the processor mode register (addresses

000416 and 000516)?

Is writing enabled in the protect register before writing in the port P9 direction register (address

03F316)?

Is writing effectuated in the port P9 direction register by the next instruction after writing is enabled in

the protect register?

Does not an interrupt generate between the instruction writing is enabled in the protect register and

the instruction writing in the port P9 direction register?

M30620FCAFP Datasheet(PDF) 571 Page - Renesas Technology Corp