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CPU System Functions
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3.5 Memory
In the following sections, the memory of the CPU is introduced. Specific
memory areas are described and a recommendation for the usage of the
address space is given.
3.5.1 Memory areas
The internal memory of the CPU provides several areas:
• Internal VFB flash area for flash memory devices
• Internal VFB ROM area for ROM mask devices
• Internal VDB RAM area
• Internal VSB flash area
• Internal VSB RAM area
• Internal fixed peripheral I/O area
• Programmable peripheral I/O area
• External memory area
The areas are briefly described below.
(1)
Internal VFB flash area
Table 3-11 summarizes the size and addresses of the ROM and flash
memories, which are accessible via the VFB (V850 Fetch Bus).
Table 3-11
VFB ROM and flash memory
Device
µPD703420
µPD70F3420
µPD703421
µPD70F3421
µPD703422
µPD70F3422
µPD70F3423
µPD70F3424
µPD70F3425
µPD70F3426
µPD70F3427
Preliminary User's Manual U17566EE1V2UM00
ROM
Flash
128 KB
–
–
128 KB
256 KB
–
–
256 KB
384 KB
–
–
384 KB
–
512 KB
–
512 KB
–
1 MB
–
1 MB
–
1 MB
Chapter 3
Address range
0000 0000
to 0001 FFFF
H
H
0000 0000
to 0001 FFFF
H
H
0000 0000
to 0003 FFFF
H
H
0000 0000
to 0003 FFFF
H
H
0000 0000
to 0005 FFFF
H
H
0000 0000
to 0005 FFFF
H
H
0000 0000
to 0007 FFFF
H
H
0000 0000
to 0007 FFFF
H
H
0000 0000
to 000F FFFF
H
H
0000 0000
to 000F FFFF
H
H
0000 0000
to 000F FFFF
H
H
119
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