HD6473847RHV Datasheet, PDF (243/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 8 I/O Ports
8.9.1 Port Data Register B (PDRB)
PDRB is a register that stores data of port B.
Bit
7 to 4
3
2
1
0
Initial
Bit Name Value
R/W
⎯
Undefined ⎯
PB3
Undefined R
PB2
R
PB1
R
PB0
R
Description
Reserved
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 bits CH3 to CH0 in AMR, that pin
reads 0 regardless of the input voltage.
8.9.2 Port Mode Register B (PMRB)
PMRB controls the selection of the PB3 pin functions.
Bit
7 to 4
Initial
Bit Name Value
⎯
All 1
3
IRQ1
0
2 to 0 ⎯
All 1
R/W Description
⎯
Reserved
These bits are always read as 1 and cannot be
modified.
R/W PB3/AN3/IRQ1 Pin Function Switch
This bit selects whether pin PB3/AN3/IRQ1 is used as
PB3/AN3 or as IRQ1.
0: PB3/AN3 input pin
1: IRQ1 input pin
⎯
Reserved
These bits are always read as 1 and cannot be
modified.
Rev. 7.00 Mar. 08, 2010 Page 211 of 510
REJ09B0024-0700