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8. I/O Ports
Port Mode Register 1 (PMR1)
PMR1 is an 8-bit read/write register, controlling the selection of pin functions for port 1 pins.
Upon reset, PMR1 is initialized to H'00.
H8/3857 Group
Bit
IRQ3
Initial value
Read/Write
R/W
H8/3854 Group
Bit
IRQ3
Initial value
Read/Write
R/W
In the H8/3854 Group, bits 6, 4, and 3 are reserved, and must always be set to 0.
Bit 7—P1
/IRQ
/TMIF Pin Function Switch (IRQ3): This bit selects whether pin
7
3
P1
/IRQ
/TMIF is used as P1
7
3
Bit 7: IRQ3
Description
0
Functions as P1
Functions as IRQ
1
Note: Rising or falling edge sensing can be designated for IRQ
For details on TMIF pin settings, see Timer Control Register F (TCRF) in section 9.5.2,
Register Descriptions.
Bit 6—P1
/IRQ
/TMIC Pin Function Switch (IRQ2): This bit selects whether pin
6
2
P1
/IRQ
/TMIC is used as P1
6
2
Bit 6: IRQ2
Description
0
Functions as P1
Functions as IRQ
1
Note: Rising or falling edge sensing can be designated for IRQ
For details on TMIC pin settings, see Timer Mode Register C (TMC) in section 9.4.2,
Register Descriptions.
Rev.3.00 Jul. 19, 2007 page 176 of 532
REJ09B0397-0300
7
6
5
IRQ2
IRQ1
0
0
0
R/W
R/W
7
6
5
⎯
IRQ1
0
0
0
⎯
R/W
or as IRQ
/TMIF.
7
3
I/O pin
7
/TMIF input pin
3
or as IRQ
/TMIC.
6
2
I/O pin
6
/TMIC input pin
2
4
3
⎯
PWM
TMOFH
0
0
⎯
R/W
4
3
⎯
⎯
TMOFH
0
0
⎯
⎯
/TMIF.
3
/TMIC.
2
2
1
TMOFL
TMOW
0
0
R/W
R/W
R/W
2
1
TMOFL
TMOW
0
0
R/W
R/W
R/W
(initial value)
(initial value)
0
0
0
0
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