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Chapter 3
CPU Function
Preliminary User’s Manual U15839EE1V0UM00
3.5.4 Programmable peripheral I/O registers
In the V850E/CA2, 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 x1200H is used exclusively for the FCAN controller.
The internal bus of the V850E/CA2 becomes active when
- the peripheral I/O register area (3FF F000H to 3FF FFFFH) or
- the programmable peripheral I/O register area (xxxx m000H to xxxx nFFFH)
is accessed (m = xx00B, n = xx11B).
Note that when data is written to the peripheral I/O register area, the written contents are reflected also
on the upper 4 KB area of the programmable peripheral I/O area.
The base address of the programmable peripheral I/O area is specified by the initialization of the
peripheral area selection control register (BPC).
Figure 3-15:
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 pro-
grammable peripheral I/O area becomes ineffective.
•
Peripheral I/O area
•
ROM area
•
RAM area
Remark:
M = xx00B
N = xx11B
3FF FFFFH
3FF F000H
3FF EFFFH
xxx NFFFH
xxx M000H
x 3FFFH
x 3000H
x 2FFFH
x 0000H
x 0FFFH
000 0000H
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
x 1000H
Summary of Contents for mPD703128
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