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Internal Flash Memory
16-3
16.4 Flash Memory Overwrite Mode and Settings
There are two flash memory overwrite modes: flash memory mode and on-board write mode. Table 16-4-1 lists the
mode settings through the external pins.
Flash memory mode is used to overwrite the internal flash memory with a ROM writer. In this mode, the flash
memory inputs and outputs are connected to external pins.
On-board write mode is used to overwrite the internal flash memory via software. This makes it possible to
overwrite the internal flash memory while the microcontroller is still mounted on a board. The address/data separate
mode or address/data multiplex mode may apply as the on-board write mode.
Table 16-4-1 Mode Settings through the External Pins
Mode name
MMOD1 MMOD0 EXMOD1 EXMOD0
Flash memory mode
H H L H
On-board write mode
(
memory extension mode
16-bit data
address/data separate
)
L L L H
On-board write mode
( )
L L H H
memory extension mode
16-bit data
address/data multiplex