Direct Page Register (Dpr) - Fujitsu MB90335 Series Hardware Manual

CHAPTER 2 CPU
2.6 Registers
2.6.6

Direct Page Register (DPR)

This section explains the direct page register (DPR) functions.
■ Direct Page Register (DPR) <Initial Value: 01
The direct page register (DPR) specifies, as shown in Figure 2.6-11, addresses 8 to 15 of an instruction
operand in the direct addressing mode. DPR has a length of 8 bits, and is initialized to "01
also allows reading and writing by instructions.
Figure 2.6-11 illustrates the generation of a physical address in the direct addressing mode.
Figure 2.6-11 Generating a Physical Address in Direct Addressing Mode
24-bit physical address
38
DTB register
MSB
FUJITSU MICROELECTRONICS LIMITED
>
H
DPR register Direct address in instruction
MB90335 Series
" by a reset. It
H
LSB
CM44-10137-6E