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Appendix B Internal I/O Registers
PMR2—Port mode register 2
Bit
⎯
Initial value
⎯
Read/Write
Note: * POF1 and UD are functions of the H8/3857 Group only.
In the H8/3854 Group these bits are reserved, and must always be cleared to 0.
Rev.3.00 Jul. 19, 2007 page 492 of 532
REJ09B0397-0300
7
6
5
⎯
⎯
1
1
0
⎯
R/W
P3 /SO pin PMOS control
0 CMOS output
1 NMOS open-drain output
P4 /IRQ pin function switch
3
0 Functions as P4 input pin
1 Functions as IRQ input pin
1
4
3
⎯
IRQ0
0
0
R/W
R/W
P2 /IRQ /ADTRG pin function switch
0
4
0 Functions as P2 I/O pin
1 Functions as IRQ /ADTRG input pin
1
P2 /UD pin function switch
1
0 Functions as P2 I/O pin
1 Functions as UD input pin
2
1
0
3
0
H'C9
2
1
POF1 *
UD *
0
0
R/W
R/W
0
4
1
I/O ports
0
IRQ4
0
R/W
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