Memory Space - Fujitsu F2MC-8L MB89620 Series Hardware Manual

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3.

Memory Space

The microcontrollers of the MB89620 series offer a memory space of 64 Kbytes. The
memory space contains the I/O area, RAM area, ROM area, and external area. The
memory space contains areas used for special purposes such as the general-purpose
registers and vector table.
n Memory Space Structure
l I/O area (addresses: 0000
• Control registers and data registers for the internal peripheral functions are located in this
area.
• As the I/O area is allocated within the memory space, I/O can be accessed in the same way
as memory. High-speed access using direct addressing is available.
RAM area
l
• Internal static RAM is provided as an internal data area.
• The internal RAM size differs between products.
• Addresses between 80
• Addresses between 100
(restrictions apply for some products).
• The contents of RAM is indeterminate after a reset.
l ROM area
• Internal ROM is provided as an internal program area.
• The internal ROM size differs between products. Setting the memory access mode to
external ROM mode enables internal ROM to be disconnected and set as an external area.
• Addresses between FFC0
External area
l
• The data and program areas can be expanded to include external areas by connecting
external RAM or ROM.
• The size of the external area differs between products.
• External bus mode must be specified to use the external area. In this case, port 0, port 1,
and port 2 become the external bus pins.
Check: The MB89628R, MB89629R, and MB89P629 only support single-chip mode and cannot use
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CHAPTER 3 CPU
to 007F
H
and FF
H
and 1FF
H
H
external ROM mode or internal ROM/external bus mode.
The MB89T623, MB89T625, and MB89V625 only support external ROM mode and cannot use
single-chip mode or internal ROM/external bus mode.
)
H
support high-speed access using direct addressing.
H
can be used as the general-purpose register area
H
and FFFF are used for the vector table, etc.
H
MB89620 series