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CPU System Functions
Chapter 3
Preliminary User’s Manual U17566EE1V2UM00
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
ROM
Flash
Address range
µPD703420
128 KB
–
0000 0000
H
to 0001 FFFF
H
µPD70F3420
–
128 KB
0000 0000
H
to 0001 FFFF
H
µPD703421
256 KB
–
0000 0000
H
to 0003 FFFF
H
µPD70F3421
–
256 KB
0000 0000
H
to 0003 FFFF
H
µPD703422
384 KB
–
0000 0000
H
to 0005 FFFF
H
µPD70F3422
–
384 KB
0000 0000
H
to 0005 FFFF
H
µPD70F3423
–
512 KB
0000 0000
H
to 0007 FFFF
H
µPD70F3424
–
512 KB
0000 0000
H
to 0007 FFFF
H
µPD70F3425
–
1 MB
0000 0000
H
to 000F FFFF
H
µPD70F3426
–
1 MB
0000 0000
H
to 000F FFFF
H
µPD70F3427
–
1 MB
0000 0000
H
to 000F FFFF
H
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