tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 61

• Manufacturer Part Number: tmp19a43fd
• Description: 32-bit Risc Microprocessor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4.2.2
and the flash version that limits reading data to building FLASH/ROM into. When ROM protecting
register ROMSEC1<RSECON > bit is "1", ROM data protecting becomes effective with FLASH
protected.
using the ROM correction function, a PC shows the instructions as residing in the flash ROM area.
Because they actually reside in the RAM area, data cannot be read in a ROM protected state. To read
data by using instructions held in the overwritten RAM area, it is necessary to write data to RAM by
using a program available in the ROM area or to use other means.
If the ROM area is put in a protected state, the following operations cannot be performed:
The following operations can be performed even if the ROM area is in a protected state:
As for ROM data protecting, the execution of the command to the flash is prohibited in the function it,
If instructions in the ROM area have been replaced with instructions in the RAM area in a PC by
ROM data Protect
Using instructions placed in areas other than the ROM area to load or store the data taken from
Store to DMAC register (NMI by the bus error is generated. )
Loading or storing the data taken from the ROM area in accordance with EJTAG
Using BOOT-ROM to load or store the data taken from the ROM area (FLASH only)
Executing flash writer to load or store the data taken from the ROM area(FLASH only)
Using instructions placed in areas other than the ROM area to access the registers (ROMSEC1,
Executing the command to unprotect automatic blocking in writer mode, performing the flash
Using instructions placed in the ROM area to load the data taken from the ROM area
Using instructions placed in all areas to load the data taken from areas other than the ROM
Using instructions placed in all areas to make instructions branch off to the ROM area
Performing PC trace (there are restrictions) or break on the ROM area in accordance with
Data transfer of ROM area by DMAC
the ROM area
ROMSEC2) that concern the protection of the ROM area
command sequences other than the automatic blocking unprotect command sequence, and
performing the flash command sequence in single or boot mode by specifying an address in
the ROM area(FLASH only)
area
EJTAG
TMP19A43 (rev2.0) 4-2
Various protecting functions
TMP19A43