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Chapter 3
CPU Functions
User’s Manual U16580EE3V1UD00
3.4.3 Wrap-around of CPU address space
(1)
Program space
Of the 32 bits of the program counter (PC), the higher 6 bits are fixed to 0 and only the lower
26 bits are valid. Even if a carry or borrow occurs from bit 25 to bit 26 as a result of branch address
calculation, the higher 6 bits ignore this and remain 0.
Therefore, the lower-limit address of the program space, 00000000H, and the upper-limit address,
03FFFFFFH, are contiguous addresses, and the program space is wrapped around at the
boundary of these addresses.
Caution:
No instructions can be fetched from the 4 KB area of 03FFF000H to 03FFFFFFH
because this area is a peripheral I/O area. Therefore, do not execute any branch
operation instructions in which the destination address will reside in any part of this
area.
Figure 3-14:
Program Space
(2)
Data space
The result of an operand address calculation that exceeds 32 bits is truncated to 32 bits.
Therefore, the lower-limit address of the data space, address 00000000H, and the upper-limit
address, FFFFFFFFH, are contiguous addresses, and the data space is wrapped around at the
boundary of these addresses.
Figure 3-15:
Data Space
03FFFFFEH
03FFFFFFH
00000000H
00000001H
Program space
Program space
(+) direction
(–) direction
FFFFFFFEH
FFFFFFFFH
00000000H
00000001H
Data space
Data space
(+) direction
(–) direction
Содержание V850E/PH2
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