HD64F38024HV Datasheet, PDF (262/684 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 Data Register B (PDRB)
Bit
7
6
5
4
3
2
1
0
PB₇
PB₆
PB₅
PB₄
PB ₃
PB₂
PB₁
PB ₀
Read/Write
R
R
R
R
R
R
R
R
Reading PDRB always gives the pin states. However, if a port B pin is selected as an analog input
channel for the A/D converter by AMR bits CH3 to CH0, that pin reads 0 regardless of the input
voltage.
Port Mode Register B (PMRB)
Bit
7
⎯
Initial value
1
Read/Write
⎯
6
5
⎯
⎯
1
1
⎯
⎯
4
3
2
⎯
IRQ1
⎯
1
0
1
⎯
R/W
⎯
1
0
⎯
⎯
1
1
⎯
⎯
PMRB is an 8-bit read/write register controlling the selection of the PB₃ pin function. Upon reset,
PMRB is initialized to H'F7.
Bits 7 to 4 and 2 to 0—Reserved
Bits 7 to 4 and 2 to 0 are reserved; they are always read as 1 and cannot be modified.
Bit 3—PB₃/AN₃/IRQ₁ Pin Function Switch (IRQ1)
These bits select whether pin PB₃/AN₃/IRQ₁ is used as PB₃/AN₃ or as IRQ₁/TMIC.
Bit 3
IRQ1
Description
0
1
Note:
Functions as PB3/AN3 input pin
Functions as IRQ1/TMIC input pin
Rising or falling edge sensing can be selected for the IRQ1/TMIC pin.
(initial value)
For TMIC pin setting information, see the Timer More Register C (TMC) description in section
9.3.2, Register Descriptions.
Rev. 8.00 Mar. 09, 2010 Page 240 of 658
REJ09B0042-0800