Renesas PCA7401 - Manual (Page 17)

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Chapter 5. Troubleshooting
The table below summarizes errors to be checked carefully before you determine them to be a fault.
5.1 Errors That Occur When Writing to PROM
(1) When Newly Purchased
(2) Previously Written Normally
Cause Remedy
Is the adapter attached to the correct position of the PROM
programmer?
Is the MCU attached to the correct position?
Is the area specification set correctly?
Is the correct device selected?
The IC socket of the PROM programmer may be stained. The
socket needs replacing.
The PROM programmer connector at which the PROM
programmer is contacted may be stained. Clean it with
alcohol, etc.
See page
Programming adapter
PROM programmer
Contact failure
9
10
10
8
-
-
Cause Remedy
Is the adapter attached to the correct position of the PROM
programmer?
Is the MCU attached to the correct position?
Is the area specification set correctly?
Is the correct device selected?
The IC socket of the PROM programmer may be stained. The
socket needs replacing.
See page
Programming adapter
PROM programmer
Contact failure
9
10
10
8
-
5.2 MCUs Do Not Function Normally
The program operates normally on the emulator, but when the MCU that has normally been written
is attached the same program does not function normally.
(1) In the emulator, NOPs are often inserted in the area where the program has not been read, therefore
the program happens to appear functioning normally even though it may have gone wild. Check
your program again.
(2) The emulator and the actual MCU may differ in characteristics. Consult the user's manual of the
emulation pod to check for differences in characteristics again.