CHAPTER 3 CPU FUNCTION
User’s Manual U12688EJ4V0UM00
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Example Application of wrap-around
00007FFFH
(R=) 00000000H
FFFFF000H
FFFF8000H
Internal ROM area
Internal peripheral
I/O area
External memory
area
FFFFE000H
Internal RAM area
32 Kbytes
4 Kbytes
4 Kbytes
24 Kbytes
0001FFFFH
When R = r0 (zero register) is specified for the LD/ST disp16 [R] instruction, an addressing range of 00000000H ±32
KB can be referenced with the sign-extended, 16-bit displacement value. By mapping the external memory in the 24
KB area in the figure, all resources including internal hardware can be accessed with one pointer.
The zero register (r0) is a register set to 0 by hardware, and eliminates the need for additional registers for the pointer.
Содержание V850E/MS1 UPD703100
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