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MB90420/5 (A) SERIES F
2.2 Memory Space
The memory space of the F
space is used for specific uses such as the expansion intelligent I/O service (EI
purpose registers, and the vector tables.
n Memory space
I/O, programs and data are all allocated somewhere in the 16-Mbytes memory space of the F
CPU. The CPU can indicate their addresses in the 24-bit address bus to access each resource. Figure 2.1
shows an example of the relationships between the F
2
F
MC-16LX Device
2
F
MC-16LX
CPU
*1: The capacity of the internal ROM depends on the product.
*2: The area that can be accessed via the image depends on the product.
*3: The capacity of the internal RAM depends on the product.
*4: No access to this area in the single-chip mode
Fig. 2.1 Example of Relationships between F
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
2
MC-16LX is 16 Mbytes and stores I/O, programs, and data. Part of the memory
FFFFFF
FFFC00
Program
FF0000
100000
010000
004000
002000
000D00
Data
000380
2
EI
OS
000180
000100
0000C0
Interrupt
0000B0
Resource
000020
General-
000000
purpose port
2
MC-16LX system and the memory map.
H
Vector table area
H
Program area
*1
H
H
External area
H
ROM Area
(image of FF bank)
*2
H
External area
H
*3
H
Data area
H
General-purpose register
H
2
EI
OS Descriptor area
H
External area
H
Interrupt control register area
H
Resource control register area
H
I/O Port control register area
H
2
MC-16LX System and Memory Map
2-4
2
OS) descriptors, the general-
2
MC-16LX
ROM area
*4
*4
RAM area
*4
I/O area
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