HD64F2168 Datasheet, PDF (736/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

key code area in programmer mode, a verification error will occur unless a software
countermeasure is taken for the PROM programmer and the version of its program.
12. The programming program that includes the initialization routine and the erasing program that
includes the initialization routine are each 2 kbytes or less. Accordingly, when the CPU clock
frequency is 33 MHz, the download for each program takes approximately 120 µs at the
maximum.
13. While an instruction in on-chip RAM is being executed, the DTC can write to the SCO bit in
FCCS that is used for a download request or FMATS that is used for MAT switching. Make
sure that these registers are not accidentally written to, otherwise an on-chip program may be
downloaded and damage RAM or a MAT switchover may occur and the CPU get out of
control. Do not use DTC to program flash related registers.
14. A programming/erasing program for flash memory used in the conventional H8S F-ZTAT
microcomputer which does not support download of the on-chip program by a SCO transfer
request cannot run in this LSI. Be sure to download the on-chip program to execute
programming/erasing of flash memory in this LSI.
15. Unlike the conventional H8S F-ZTAT microcomputer, no countermeasures are available for a
runaway by WDT during programming/erasing. Prepare countermeasures (e.g. use of the
periodic timer interrupts) for WDT with taking the programming/erasing time into
consideration as required.
Rev. 3.00, 03/04, page 696 of 830