H838537 Datasheet, PDF (183/508 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

Section 8 I/O Ports
PUCR1 controls whether the MOS pull-up of each of the port 1 pins P1₇ to P1₀ is on or off. When
a PCR1 bit is cleared to 0, setting the corresponding PUCR1 bit to 1 turns on the MOS pull-up for
the corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR1 is initialized to H'00.
(4) Port Mode Register 1 (PMR1)
Bit
Initial value
Read/Write
7
IRQ3
0
R/W
6
IRQ2
0
R/W
5
IRQ1
0
R/W
4
IRQ4
0
R/W
3
TMIG
0
R/W
2
TMOFH
0
R/W
1
TMOFL
0
R/W
0
TMOW
0
R/W
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.
Bit 7: P1₇/IRQ₃/TMIF pin function switch (IRQ3)
This bit selects whether pin P1₇/IRQ₃/TMIF is used as P1₇ or as IRQ₃/TMIF.
Bit 7
IRQ3
Description
0
1
Note:
Functions as P1 I/O pin
7
(initial value)
Functions as IRQ₃/TMIF input pin
Rising or falling edge sensing can be designated for IRQ , TMIF. For details on TMIF
3
settings, see (3) Timer Control Register F (TCRF) in section 9.4.2, Register Descriptions.
Bit 6: P1₆/IRQ₂ pin function switch (IRQ2)
This bit selects whether pin P1₆/IRQ₂ is used as P1₆ or as IRQ₂.
Bit 6
IRQ2
Description
0
1
Note:
Functions as P1₆ I/O pin
Functions as IRQ₂ input pin
Rising or falling edge sensing can be designated for IRQ .
2
(initial value)
Rev. 1.00 May 30, 2008 Page 163 of 484
REJ09B0436-0100