Direct Page Register (Dpr) - Fujitsu F2MC-16LX Hardware Manual

2.3.6

Direct Page Register (DPR)

The function of direct page register (DPR) is explained.
Direct Page Register (DPR) <Initial Value:01
The direct page register (DPR) specifies the addresses 8 to addresses 15 of instruction operand in the direct
addressing mode as shown in Figure 2.3-11. The DPR having the 8-bit length is initialized to 01
reset. In addition, it can be read and written by the instruction.
Figure 2.3-11 shows the generation of the physical address in the direct addressing mode.
Figure 2.3-11 Physical address Generation in the Direct addressing Mode
24-bit physical address
DTB register
αααααααα
MSB
>
H
DPR register
ββββββββ
ααααααααββββββββγγγγγγγγ
CHAPTER 2 CPU
by the
H
Direct addressing
during instruct
γγγγγγγγ
LSB
41