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CHAPTER 28 3M-BIT FLASH MEMORY
28.9
Reset Vector Address in Flash Memory
The MB90F394H(A) support a hard-wired reset vector.
When the addresses "FFFFDC
vector mode, the values that have been determined by the hard-wired logic in advance
are read. However, in flash memory mode, as mentioned in the previous chapter, all
addresses can be accessed.
Consequently, it is meaningless to write data to these addresses. Especially when
programming flash memory from the CPU (that is, not in flash memory mode), do not
read these addresses for software polling. Otherwise, the flash memory returns a fixed
reset vector instead of the hardware sequence flag value.
■ Reset Vector Address in Flash Memory
Table 28.9-1 lists the reset vector and mode data values.
Table 28.9-1 Reset Vector and Mode Data Values
Note:
Because of the hard-wired reset vector, it is not necessary to specify the reset vector in the software.
However it is recommended to specify the same vector and the same mode data in the program, this
will prevent the Mask ROM device to behave differently from the Flash device when the same
program is used.
586
" to "FFFFDF
H
Reset vector
Mode data
" are accessed for reading data in internal
H
FFA000
H
00
H
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