H8SXSLASH1663M datasheet(1236/1504 Pages) RENESAS

1236 / 1504 page

Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1204 of 1468

REJ09B0412-0200

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/erasure 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

immediately after 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 general registers ER0 and ER1 are not saved during download of an on-chip

program, initialization, programming, or erasure. When needed, save the general registers

before a download request or before execution of initialization, programming, or erasure using

the procedure program.

H8SX/1663M Datasheet(PDF) 1236 Page - Renesas Technology Corp