HD6473837H Datasheet, PDF (192/562 Pages) Renesas Technology Corp – Hardware Manual

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
PB₇
PB₆
PB₅
PB₄
PB₃
PB₂
PB₁
PB₀
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.
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