h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 494

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

11. If data other than H'FF (four bytes) is written to the key code area (H'00003C to H'00003F) of
12. The programming program that includes the initialization routine and the erasing program that
13. While an instruction in on-chip RAM is being executed, the DMAC can write to the SCO bit in
14. A programming/erasing program for flash memory used in the conventional F-ZTAT H8S
15. Unlike the conventional F-ZTAT H8S microcomputer, no countermeasures are available for a
16. While writing 1 to the SCO bit and downloading the internal programs, the WDT coutup
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flash memory, reading cannot be performed in programmer mode. (In this case, data is read as
H'00. Rewrite is possible after erasing the data.) For reading in programmer mode, make sure
to write H'FF to the entire key code area. If data other than H'FF is to be written to the key
code area in programmer mode, a verification error will occur unless a software
countermeasure is taken for the PROM programmer.
includes the initialization routine are each 2 kbytes or less. Accordingly, when the CPU clock
frequency is 10 MHz, the download for each program takes approximately 600 µs at the
maximum.
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 DMAC to program flash related registers.
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.
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.
operation stops.