HD64F3694FXV Datasheet, PDF (146/452 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
9.2.3 Pin Functions
The correspondence between the register specification and the port functions is shown below.
P22/TXD pin
Register
Bit Name
Setting
Value
PMR1
TXD
0
1
Legend: X: Don't care.
PCR2
PCR22
0
1
X
Pin Function
P22 input pin
P22 output pin
TXD output pin
P21/RXD pin
Register
Bit Name
Setting
Value
SCR3
RE
0
1
Legend: X: Don't care.
PCR2
PCR21
0
1
X
Pin Function
P21 input pin
P21 output pin
RXD input pin
P20/SCK3 pin
Register
SCR3
Bit Name
CKE1
Setting Value 0
0
0
1
Legend: X: Don't care.
CKE0
0
0
1
X
SMR
COM
0
1
X
X
PCR2
PCR20
0
1
X
X
X
Pin Function
P20 input pin
P20 output pin
SCK3 output pin
SCK3 output pin
SCK3 input pin
Rev.5.00 Nov. 02, 2005 Page 116 of 418
REJ09B0028-0500