Direct Bank Pointer (Dp) - Fujitsu F2MC-8FX Hardware Manual

5.1.2

Direct Bank Pointer (DP)

The direct bank pointer (DP) in bits 10 to 8 of the program status (PS) register specifies
the area to be accessed by direct addressing.
Configuration of Direct Bank Pointer (DP)
Figure 5.1-4 shows the configuration of the direct bank pointer.
RP
bit15 bit14 bit13 bit12 bit11 bit10 bit9
PS
R4 R3 R2
The areas from 0000
0000 to 007F
H
0080 to 047F
H
Table 5.1-1 shows the relationship between direct bank pointer (DP) and access area; Table 5.1-2 lists the
direct addressing instructions.
Table 5.1-1 Direct Access Pointer and Access Area
Direct bank pointer (DP) [2:0]
XXX
Figure 5.1-4 Configuration of Direct Bank Pointer
DP
DP2 DP1 DP0
R1 R0
to 007F and 0080
H H
is specified with an operand regardless of the value in the direct bank pointer. Access to
H
is specified with the value in the value of the direct bank pointer and the operand.
H
(It doesn't affect the mapping. )
B
000
(Initial value)
B
001
B
010
B
011
B
100
B
101
B
110
B
111
B
bit8 bit7 bit6 bit5 bit4
H I IL1 IL0
to 047F can be accessed by direct addressing. Access to
H H
Operand-specified dir
0000 to 007F
H
0080 to 00FF
H
CCR
bit3 bit2 bit1 bit0
N Z V C
Access area
0000
H H
0080
H
0100
H
0180
H
0200
H
H
0280
H
0300
H
0380
H
0400
H
CHAPTER 5 CPU
DP Initial
value
000
B
to 007F
H
to 00FF
H
to 017F
H
to 01FF
H
to 027F
H
to 02FF
H
to 037F
H
to 03FF
H
to 047F
H
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