Hitachi H8/3692 ユーザーズマニュアル
Rev. 1.0, 07/01, page 118 of 372
P21/RXD pin
Register
SCR3
PCR2
Bit Name
RE
PCR21
Pin Function
Setting Value 0
0
P21 input pin
0
1
P21 output pin
1
X
RXD input pin
Legend X:Don't care.
P20/SCK3 pin
Register
SCR3
SMR
PCR2
Bit Name
CKE1
CKE0
COM
PCR20
Pin Function
Setting Value
0
0
0
0
P20 input pin
0
0
0
1
P20 output pin
0
0
1
X
SCK3 output pin
0
1
X
X
SCK3 output pin
1
X
X
X
SCK3 input pin
Legend X:Don't care.
9.3
Port 5
Port 5 is a general I/O port also functioning as an I
2
C bus interface I/O pin, an A/D trigger input
pin, wakeup interrupt input pin. Each pin of the port 5 is shown in figure 9-3. The register setting
of the I
of the I
2
C bus interface register has priority for functions of the pins P57/SCL and P56/SDA.
P57/SCL
P56/SDA
P55/
/
P54/
P53/
P52/
P51/
P50/
Port 5
Figure 9-3 Port 5 Pin Configuration