TMP89FS60 datasheet(324/410 Pages) TOSHIBA

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Page 310

21. Flash Memory

TMP89FS60

RA003

21.2.3 RAM area switching (SYSCR3<RAREA>)

If "0xD4" is set on SYSCR4 after SYSCR3<RAREA> is set to "1" in MCU mode, RAM is mapped to the

code area. To restore the RAM area to the initial state of mapping, set SYSCR3<RAREA> to "0", and then set

"0xD4" on SYSCR4.

In serial PROM mode, RAM is mapped to the code area, irrespective of the SYSCR3<RAREA> setting.

21.2.4 BOOTROM area switching (FLSCR1<BAREA>)

If "0xD5" is set on FLSCR2<CR1EN> after FLSCR1<BAREA> is set to "1" in MCU mode, 0x1000 through

0x17FF in the code and data areas is masked by flash memory, and 2K-byte (first half of 4KB) BOOTROM is

mapped. If you do not want to map BOOTROM, set "0xD5" on FLSCR2<CR1EN> after setting

FLSCR1<BAREA> to "0".

A set of codes for programming flash memory in serial PROM mode are built into BOOTROM, and a sup-

port program (API) for performing an erase or write on flash memory in a simple manner is also built into one

part in the BOOTROM area. Therefore, by calling a subroutine in the support program after BOOTROM is

mapped, it is possible to erase, write and read flash memory easily.

In serial PROM mode, BOOTROM is mapped to 0x1000 through 0x17FF in the data area and 0x1000

through 0x1FFF in the code area, irrespective of the FLSCR1<BAREA> setting. BAREA is always "1", and

the set BAREA value remains unchanged, even if data is written. "1" is always read from BAREA.

Note:

Do not allocate the FLSCR1<FAREA> switching program to the code area 0x1000 through 0x1FFF. If it is

allocated to that area, the software program may not function properly, and the microcontroller may malfunc-

tion.

TMP89FS60 Datasheet(PDF) 324 Page - Toshiba Semiconductor