HD64F38024HV Datasheet, PDF (234/684 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 Control Register 4 (PCR4)
Bit
7
6
5
4
3
2
1
0
⎯
⎯
⎯
⎯
⎯ PCR4₂ PCR4₁ PCR4 ₀
Initial value
1
1
1
1
1
0
0
0
Read/Write
⎯
⎯
⎯
⎯
⎯
W
W
W
PCR4 is an 8-bit register for controlling whether each of port 4 pins P4₂ to P4₀ functions as an
input pin or output pin. Setting a PCR4 bit to 1 makes the corresponding pin an output pin, while
clearing the bit to 0 makes the pin an input pin. PCR4 and PDR4 settings are valid when the
corresponding pins are designated for general-purpose input/output by SCR3.
Upon reset, PCR4 is initialized to H'F8.
PCR4 is a write-only register, which is always read as all 1s.
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 switching of the P4₃/IRQ₀ pin functions. For the
functions of the other bits, see the descriptions of port 1 (WDCKS and NCS) and port 3 (POF1).
Bit 0—P4₃/IRQ₀ Pin Function Switch (IRQ₀)
This bit selects whether pin P4₃/IRQ₀ is used as P4₃ or as IRQ₀.
Bit 0
IRQ0
0
1
Description
Functions as P43 input pin
Functions as IRQ0 input pin
(initial value)
Rev. 8.00 Mar. 09, 2010 Page 212 of 658
REJ09B0042-0800