H8S-2128 Datasheet, PDF (230/843 Pages) Renesas Technology Corp – Single-Chip Microcomputer

8.6 Port 5
8.6.1 Overview
Port 5 is a 3-bit I/O port. Port 5 pins also function as SCI0 I/O pins (TxD0, RxD0, SCK0), and the
IIC0 I/O pin (SCL0) (option in H8S/2128 Series only). In the H8S/2128 Series, P52 and SCK0 are
NMOS push-pull outputs, and SCL0 is an NMOS open-drain output. Port 5 pin functions are the
same in all operating modes.
Figure 8.13 shows the port 5 pin configuration.
Port 5 pins
Port 5
P52 (I/O)/SCK0 (I/O)/SCL0 (I/O)
P51 (I/O)/RxD0 (Input)
P50 (I/O)/TxD0 (Output)
Figure 8.13 Port 5 Pin Functions
8.6.2 Register Configuration
Table 8.11 shows the port 5 register configuration.
Table 8.11 Port 5 Registers
Name
Abbreviation R/W
Port 5 data direction register P5DDR
W
Port 5 data register
P5DR
R/W
Note: * Lower 16 bits of the address.
Initial Value
H'F8
H'F8
Address*
H'FFB8
H'FFBA
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