Reset Vector Addresses In Flash Memory - Fujitsu MB90335 Series Hardware Manual

MB90335 Series
22.5

Reset Vector Addresses in Flash Memory

The flash memory products of this series use hardwired reset vectors.
In CPU mode, any read access to addresses FFFFDC
fixed value. In flash memory mode, by contrast, these addresses are accessible.
Writing to these addresses is therefore meaningless. When programming the flash
memory by CPU access, in particular, do not read these addresses by software polling.
In that case, fixed reset vector values are read in place of flash memory status flag
values.
■ Hardwired Reset Vector Addresses
Table 22.5-1 lists reset vectors and mode data fixed values.
Table 22.5-1 Reset Vectors and Mode Data Fixed Values
Reset Vector
Mode Data
Note:
Reset vectors and mode data have values indicated as above, so values of them in the program
written to flash memory have no effect on operation. However, when using the same program in
mask ROM, it is possible to operate differently, therefore, be sure to write the same data to flash
memory.
CM44-10137-6E FUJITSU MICROELECTRONICS LIMITED
CHAPTER 22 DUAL OPERATION FLASH MEMORY
22.5 Reset Vector Addresses in Flash Memory
to FFFFDF
H
Address
FFFFDC
H
FFFFDD
H
FFFFDE
H
FFFFDF
H
returns a hardware-
H
Data (Fixed Value)
00
H
E0
H
FF
H
00
H
493