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CHAPTER 4 RESET
Reference:
Use a mode pin, from which reset vectors and mode data are read, to specify either internal
ROM or external memory. If the external vector mode is specified with a mode pin, however,
external memory and not internal ROM is accessed to read reset vectors and mode data.
Fujitsu recommends specifying the internal vector mode with a mode pin when the single-
chip mode and internal ROM external bus mode are used.
❍ Mode data (Address: FFFFDF
The data in the mode register can be modified only by a reset, and the mode register settings
become effective after a reset. Refer to Section "7.3 Mode Data", for details on mode data.
❍ Reset vector (Address: FFFFDC
Write the execution start address after the end of a reset. Execution starts from this address.
102
Figure 4.4-2 Transfer of reset vectors and mode data
Memory space
FFFFDF
Mode data
H
FFFFDE
Reset vector bit23 to bit16
H
FFFFDD
Reset vector bit15 to bit8
H
FFFFDC
Reset vector bit7 to bit0
H
)
H
H
to FFFFDE
)
H
2
F
MC-16LX CPU Core
Mode
register
Micro ROM
Sequence for
resetting
PCB
PC
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