HD64336900G Datasheet, PDF (155/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

9.6 Port B
Port B is an input port also functioning as an A/D converter analog input pin and LVD external
comparison voltage input pin. Each pin of the port B is shown in figure 9.6.
Port B
PB3/AN3/ExtU
PB2/AN2/ExtD
PB1/AN1
PB0/AN0
Figure 9.6 Port B Pin Configuration
Port B has the following register.
• Port data register B (PDRB)
9.6.1 Port Data Register B (PDRB)
PDRB is a general input-only port data register of port B.
Initial
Bit
Bit Name Value R/W Description
7 to 4 


Reserved
3
PB3

R
The input value of each pin is read by reading this
2
PB2

R
register.
1
PB1

R
However, if a port B pin is designated as an analog input
channel by ADCSR in A/D converter or external
0
PB0

R
comparison voltage input pin by LVDCR in low-voltage
detection circuit, 0 is read.
Rev. 1.00, 11/03, page 127 of 376