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121
CPU System Functions
Chapter 3
Preliminary User’s Manual U17566EE1V2UM00
(3)
Internal VSB flash area (µPD70F3426 only)
The µPD70F3426 provides additional flash memory, accessible via the VSB
(V850 System Bus).
(4)
Internal VSB RAM area (µPD70F3426 only)
The µPD70F3426 provides additional RAM, accessible via the VSB (V850
System Bus).
(5)
Fixed peripheral I/O area
The 4 KB area between addresses 03FF F000
H
and 03FF FFFF
H
is provided
as the fixed peripheral I/O area. Accesses to these addresses are passed over
to the NPB bus (internal bus).
The following registers are memory-mapped to the peripheral I/O area:
• All registers of peripheral functions
• Registers of timers
• Configuration registers of interrupt, DMA, bus and memory controllers
• Configuration registers of the clock controller
For a list of all peripheral I/O registers, see
“Special Function Registers“ on
page 891
.
Note
1.
Because the physical address space covers 64 MB, the address bits
A[31:26] are not considered. Thus, this address space can also be
addressed via the area FFFF 0000
H
to FFFF FFFF
H
. This has the
advantage that the area can be indirectly addressed by an offset and the
zero base r0.
Therefore, in this manual, all addresses of peripheral I/O registers in the
4 KB peripheral I/O area are given in the range FFFF F000
H
to
FFFF FFFF
H
instead of 03FF F000
H
to 03FF FFFF
H
.
2.
The
fixed
peripheral I/O area is mirrored to the upper 4 KB of the
programmable
peripheral I/O area PPA - regardless of the base address of
the PPA. If data is written to one area, it appears also in the other area.
3.
Program fetches cannot be executed from any peripheral I/O area.
4.
Word registers, that means 32-bit registers, are accessed in two half word
accesses. The lower two address bits are ignored.
Table 3-13
Internal VSB flash memory
Device
Flash size Address range
µPD70F3426
1 MB
0010 0000
H
to 001F FFFF
H
Table 3-14
Internal VSB RAM
Device
RAM size
Block
Number
Size
Address
µPD70F3426
24 KB
0
12 KB
0060 0000
H
– 0060 2FFF
H
1
12 KB
0060 3000
H
– 0060 5FFF
H
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