Datasheet

V850ES/JG3 CHAPTER 3 CPU FUNCTION
R01UH0015EJ0300 Rev.3.00 Page 45 of 870
Sep 30, 2010
(a) Application example of wraparound
If R = r0 (zero register) is specified for the LD/ST disp16 [R] instruction, a range of addresses 00000000H ±32
KB can be addressed by sign-extended disp16. All the resources, including the internal hardware, can be
addressed by one pointer.
The zero register (r0) is a register fixed to 0 by hardware, and practically eliminates the need for registers
dedicated to pointers.
Example:
μ PD70F3742
Internal ROM area
On-chip peripheral
I/O area
Internal RAM area
32 KB
4 KB
28 KB
(R = )
000FFFFFH
00007FFFH
00000000H
FFFFF000H
FFFFEFFFH
FFFF8000H