H8SX1663 datasheet(1008/1158 Pages) RENESAS

1008 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 956 of 1102

REJ09B0294-0100

12. A programming/erasing program for the flash memory used in a conventional F-ZTAT H8,

H8S microcomputer which does not support download of the on-chip program by setting the

SCO bit in FCCS to 1 cannot run in this LSI. Be sure to download the on-chip program to

execute programming/erasing of the flash memory in this F-ZTAT H8SX microcomputer.

13. Unlike a conventional F-ZTAT H8 or H8S microcomputers, measures against a program crash

are not taken by WDT while programming/erasing and downloading a programming/erasing

program. When needed, measures should be taken by user. A periodic interrupt generated by

the WDT can be used as the measures, as an example. In this case, the interrupt generation

period should take into consideration time to program/erase the flash memory.

14. When downloading the programming/erasing program, do not clear the SCO bit in FCCS to 0

after immediately setting it to 1. Otherwise, download cannot be performed normally.

Immediately after executing the instruction to set the SCO bit to 1, dummy read of the FCCS

must be executed twice.

15. The contents of some registers are not saved in a programming/erasing program. When

needed, save registers in the procedure program.

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