HD64F38024HV Datasheet, PDF (228/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 8 I/O Ports
Port Pull-Up Control Register 3 (PUCR3)
Bit
Initial value
Read/Write
7
6
5
4
3
2
1
0
PUCR3₇ PUCR3₆ PUCR3₅ PUCR3₄ PUCR3₃ PUCR3₂ PUCR3₁ PUCR3₀
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PUCR3 controls whether the MOS pull-up of each of the port 3 pins P3₇ to P3₀ is on or off. When
a PCR3 bit is cleared to 0, setting the corresponding PUCR3 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, PUCR3 is initialized to H'00.
Port Mode Register 2 (PMR2)
Bit
7
—
Initial value
1
Read/Write
—
6
5
4
—
POF1
—
1
0
1
—
R/W
—
3
2
1
0
— WDCKS NCS IRQ0
1
0
0
0
—
R/W
R/W
R/W
PMR2 is an 8-bit read/write register. It controls whether the PMOS transistor internal to P3₅ is on
or off, the selection of the watchdog timer clock, the selection of TMIG noise cancellation, and
switching of the P4₃/IRQ₀ pin functions.
Upon reset, PMR2 is initialized to H'D8.
This section only deals with the bit that controls whether the PMOS transistor internal to pin P3₅ is
on or off. For the functions of the other bits, see the descriptions of port 1 (WDCKS and NCS) and
port 4 (IRQ0).
Bit 5—Pin P3₅ PMOS Transistor Control (POF1)
This bit selects whether the PMOS transistor of the output buffer for pin P3₅ is on or off.
Bit 5
POF1
Description
0
CMOS output
(initial value)
1
NMOS open-drain output
Note: The pin is an NMOS open-drain output when this bit is set to 1 and P35 is an output.
Rev. 8.00 Mar. 09, 2010 Page 206 of 658
REJ09B0042-0800