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Chapter 3
CPU Function
Preliminary User’s Manual U14913EE1V0UM00
3.4.9 Programmable peripheral I/O registers
In the V850E/CA1, the 16 KB area of x0000H to x3FFFH is provided as a programmable peripheral I/O
area. In this area, the area between x0000H and x0FFFH is used exclusively for the FCAN controller.
The internal bus of the V850E/CA1 becomes active when the peripheral I/O register area (FFFF000H to
FFFFFFFH) or the programmable peripheral I/O register area (xxxxm000H to xxxxnFFFH) is accessed
(m = xx00B, n = xx11B). Note that when data is written to the peripheral I/O register area, the written
contents is reflected on the peripheral I/O register since peripheral I/O register area is allocated to the
last 4 KB of the programmable peripheral I/O register area.
Figure 3-14: Programmable Peripheral I/O Register (Outline)
Cautions: 1. The CAN message buffer register can allocate address xxxx freely as a program-
mable peripheral I/O register. but once the address xxxx is set, it cannot be
changed.
2. If the programmable peripheral I/O area overlaps the following areas, the program-
mable peripheral I/O area becomes ineffective.
•Peripheral I/O area
•ROM area
•RAM area
Remark:
M = xx00B
N = xx11B
3FFFFFFH
3FFF000H
3FFEFFFH
xxxxNFFFH
xxxxM000H
x3FFFH
x3000H
x2FFFH
x0000H
x0FFFH
0000000H
Peripheral
I/O register
Programmable
peripheral
I/O register
Internal local bus
Dedicated area for
FCAN controller
Peripheral
I/O area
Programmable
peripheral
I/O area
x1000H
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