HD6473887 Datasheet, PDF (191/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

8.12 Port B
8.12.1 Overview
Port B is an 8-bit input-only port, configured as shown in figure 8-11.
Port B
PB₇/AN₇
PB₆/AN₆
PB₅/AN₅
PB₄/AN₄
PB₃/AN₃
PB₂/AN₂
PB₁/AN₁
PB₀/AN₀
Figure 8-11 Port B Pin Configuration
8.12.2 Register Configuration and Description
Table 8-32 shows the port B register configuration.
Table 8-32 Port B Register
Name
Port data register B
Abbrev.
R/W
PDRB
R
Address
H'FFDE
Port Data Register B (PDRB)
Bit
7
6
5
4
3
2
1
0
PB ₇
PB₆
PB₅
PB ₄
PB₃
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.
174