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Chapter 3
CPU Functions
User’s Manual U16580EE3V1UD00
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On-chip peripheral I/O area (SFR area)
A 4 KB area from FFFF000H to FFFFFFFH is provided as the on-chip peripheral I/O area.
An image of addresses FFFF000H to FFFFFFFH can be seen at addresses 3FFF000H to
3FFFFFFH
Note
.
Note:
Addresses 3FFF000H to 3FFFFFFH are access-prohibited. To access the on-chip peripheral
I/O, specify addresses FFFF000H to FFFFFFFH.
Figure 3-22:
On-Chip Peripheral I/O Area
Peripheral I/O registers assigned with functions such as on-chip peripheral I/O operation mode
specification and state monitoring are mapped to the on-chip peripheral I/O area. Program fetches
are not allowed in this area.
Cautions: 1. For registers in which byte access is possible, if half-word access is executed,
the higher 8 bits become undefined during a read operation, and the lower 8 bits
of data are written to the register during a write operation. Do not access an 8-bit
register in half-word units.
2. Addresses that are not defined as registers are reserved for future expansion. If
these addresses are accessed, the operation is undefined and not guaranteed.
FFFFFFFH
FFFF000H
On-chip peripheral I/O area
(4 KB)
Содержание V850E/PH2
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