Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 3 CPU FUNCTION
R01UH0042EJ0500 Rev.5.00 Page 74 of 1513
Aug 12, 2011
3.4.5 Recommended use of address space
The architecture of the V850ES/JG3-H and V850ES/JH3-H requires that a register that serves as a pointer be secured
for address generation when operand data in the data space is accessed. The address stored in this pointer ±32 KB can
be directly accessed by an instruction for operand data. Because the number of general-purpose registers that can be
used as a pointer is limited, however, by keeping the performance from dropping during address calculation when a pointer
value is changed, as many general-purpose registers as possible can be secured for variables, and the program size can
be reduced.
(1) Program space
Of the 32 bits of the PC (program counter), the higher 6 bits are fixed to 0, and only the lower 26 bits are valid.
Regarding the program space, therefore, a 64 MB space of contiguous addresses starting from 00000000H
unconditionally corresponds to the memory map.
To use the internal RAM area as the program space, access the following addresses.
Caution If a branch instruction is at the upper limit of the internal RAM area, a prefetch operation (invalid
fetch) straddling the on-chip peripheral I/O area does not occur.
RAM Size Access Address
48 KB 03FF3000H to 03FFEFFFH
40 KB 03FF5000H to 03FFEFFFH
32 KB 03FF7000H to 03FFEFFFH