HD404459 Datasheet, PDF (51/122 Pages) Renesas Technology Corp – 4-bit HMCS400-series microcomputers

HD404459 Series
Pins R0₀–R0₃ are multiplexed with peripheral pins INT₀–INT₃, respectively. The peripheral function modes
of these pins are selected by bits 0–3 (PMRB0–PMRB3) of port mode register B (PMRB: $024) (figure
31).
Port mode register B (PMRB: $024)
Bit
Initial value
Read/Write
Bit name
3
0
W
PMRB3
2
0
W
PMRB2
1
0
W
PMRB1
0
0
W
PMRB0
PMRB0
0
1
R0₀/INT₀ mode selection
R0₀
INT₀
PMRB1
0
1
R0₁/INT₁ mode selection
R0₁
INT₁
PMRB2
0
1
R0₂/INT₂ mode selection
R0₂
INT₂
PMRB3
0
1
R0₃/INT₃ mode selection
R0₃
INT₃
Figure 31 Port Mode Register B (PMRB)
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