Renesas Hitachi H8S/2191, Hardware Manual

Page: 274 / 1065

Rev. 2.0, 11/00, page 247 of 1037
11.4 Port 2
11.4.1 Overview
Port 2 is an 8-bit I/O port. Table 11.8 shows the port 2 configuration.
Port 2 consists of pins that are used both as standard I/O ports (P27 to P20) and SCI clock I/O
(SCK1, SCK2), receive data input (SI1, SI2), send data output (SO1, SO2), I
2
C bus interface
clock I/O (SCL), or data I/O (SCL). It is switched by port mode register 2 (PRM2), serial mode
register (SMR), serial control register 2 (SCR), I
2
C bus control register (ICCR), and port control
register (PCR2).
Port 2 can select the MOS pull-up function.
Table 11.8 Port 2 Configuration
Port Function Alternative Function
P27 (standard I/O port) SCK2 (SCI2 clock I/O)
P26 (standard I/O port) SO2 (SCI2 transmit data output)
P25 (standard I/O port) SI2 (SCI2 receive data input)
P24 (standard I/O port) SCL (I
2
C bus interface clock I/O)
P23 (standard I/O port) SDA (I
2
C bus interface data I/O)
P22 (standard I/O port) SCK1 (SCI1 clock I/O)
P21 (standard I/O port) SO1 (SCI1 transmit data output)
Port 2
P20 (standard I/O port) SI1 (SCI1 receive data input)
11.4.2 Register Configuration
Table 11.9 shows the port 2 register configuration.
Table 11.9 Port 2 Register Configuration
Name Abbrev. R/W Size Initial Value Address *
Port mode register 2 PMR2 R/W Byte H'1E H'FFCF
Port control register 2 PCR2 W Byte H'00 H'FFD2
Port data register 2 PDR2 R/W Byte H'00 H'FFC2
MOS pull-up select
register 2 PUR2 R/W Byte H'00 H'FFE2
Note:
*
Lower 16 bits of the address.