Pin Functions - Renesas H8 Series Hardware Manual

9.2.3

Pin Functions

The correspondence between the register specification and the port functions is shown below.
• P22/TXD pin
Register PMR1
Bit Name TXD
Setting 0
value
1
[Legend]
X: Don't care
• P21/RXD pin
Register SCR3
Bit Name RE
Setting 0
value
1
[Legend]
X: Don't care
• P20/SCK3 pin
Register SCR3
Bit Name CKE1
Setting value 0
0
0
1
[Legend]
X: Don't care
PCR2
PCR22 Pin Function
0 P22 input pin
1 P22 output pin
X TXD output pin
PCR2
PCR21 Pin Function
0 P21 input pin
1 P21 output pin
X RXD input pin
SMR
CKE0 COM
0 0
0 1
1 X
X X
PCR2
PCR20 Pin Function
0 P20 input pin
1 P20 output pin
X SCK3 output pin
X SCK3 output pin
X SCK3 input pin
Rev. 3.00 Sep. 14, 2006 Page 123 of 408
Section 9 I/O Ports
REJ09B0105-0300