
Chapter 8 Appendices
■Cautions on operating the ROM writer
(1)The Vpp programming voltage for the EPROM versions is 12.5V. Programming with a
(2)Make sure that the socket adapter matches the ROM writer socket and that the chip is correctly mounted in the socket adapter. Faulty connections can lead to damage.
(3)After clearing all memory of the ROM writer, load the program. (Write the data X'FF' on the address X'0000' to X'7FFF'.)
(4)After confirming the device name, write the addresses from the start to the final address.
(5)The option bits for supporting the mask option are prepared at the final ROM address.
This writer has no internal ID codes of Silicon Signature and Intelligent Identifier of the
■When disabling the writing
When disabling the writing, check the following points.
(1)Check that the device is mounted correctly on the socket.(pin bending, connecting failure).
(2)Check that the erase check result is no problem.
(3)Check that the adapter type is identical to the device name. (4)Check that the writing mode is set correctly.
(5)Check that the data is correctly transferred to the ROM writer. (6)Recheck the check points (1),(2) and (3) provided on the above
paragraph of ìCautions on Handling the ROM writerî.
When the writing is disabled even after the above check points are confirmed and the device is replaced with another one, contact the nearest semiconductor design center.
(See the attached sales office table.)
136 EPROM Versions