Renesas H8 Series Hardware Manual page 280

Section 8 I/O Ports
Port Data Register B (PDRB)
Bit 7
PB
Read/Write 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
PMRB is an 8-bit read/write register controlling the selection of the PB
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—PB /AN /
3 3
I R Q
These bits select whether pin PB
Bit 3
IRQ1 Description
0 Functions as PB
1 Functions as
Note: Rising or falling edge sensing can be selected for the
For TMIC pin setting information, see the Timer More Register C (TMC) description in section
9.3.2, Register Descriptions.
Rev. 7.00 Mar 10, 2005 page 238 of 652
REJ09B0042-0700
6 5
PB PB
7 6 5
R R
6 5
 
1 1
 
Pin Function Switch (IRQ1)
1
/AN /
3 3
I R Q
/AN input pin
3 3
/TMIC input pin
1
I R Q
4 3
PB PB
3
4
R R
4 3

IRQ1
1 0

R/W
is used as PB /AN or as
1 3 3
1
I R Q
2 1
PB PB
2 1
R R
2 1
 
1 1
 
pin function. Upon reset,
3
/TMIC.
1
I R Q
(initial value)
/TMIC pin.
0
PB
0
R
0

1
