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| 型号： | UPD70F3271YGF-JBT-A |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件页数： | 103/129页 |
| 文件大小： | 8549K |
| 代理商： | UPD70F3271YGF-JBT-A |
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CHAPTER 3 CPU FUNCTION
User’s Manual U16541EJ5V1UD
75
3.4.5
Recommended use of address space
The architecture of the V850ES/SG2 and V850ES/SG2-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
24 KB
03FF9000H to 03FFEFFFH
(2) Data space
With the V850ES/SG2 and V850ES/SG2-H, it seems that there are sixty-four 64 MB address spaces on the 4
GB CPU address space. Therefore, the least significant bit (bit 25) of a 26-bit address is sign-extended to 32
bits and allocated as an address.
<R>
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