Hitachi H8/3664 Hardware Manual page 159

Bit 5—P15/IRQ1 Pin Function Switch (IRQ1): This bit selects whether pin P15/IRQ1 is used as
P15 or as IRQ1.
Bit 5: IRQ1
0
1
Note: Rising or falling edge sensing can be designated for IRQ1.
Bit 4—P14/IRQ0 Pin Function Switch (IRQ0): This bit selects whether pin P14/IRQ0 is used as
P14 or as IRQ0.
Bit 4: IRQ0
0
1
Bit 3—Reserved Bit: Bit 3 is reserved: it is always read as 1 and cannot be modified.
Bit 2—Reserved Bit: Bit 2 is reserved: it is always read as 1 and cannot be modified.
Bit 1—P22/TXD Pin Function Switch (TXD): This bit selects whether pin P22/TXD is used as
P22 or as TXD.
Bit 1: TXD
0
1
Bit 0—P10/TMOW Pin Function Switch (TMOW): This bit selects whether pin P10/TMOW is
used as P10 or as TMOW.
Bit 0: TMOW
0
1
Description
Functions as P15 I/O pin
Functions as IRQ1 input pin
Description
Functions as P14 I/O pin
Functions as IRQ0 output pin
Description
Functions as P22 I/O pin
Functions as TXD output pin
Description
Functions as P10 I/O pin
Functions as TMOW output pin
(Initial value)
(Initial value)
(Initial value)
(Initial value)
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