Table 8-9 Port 3 Pin Functions
Pin
Pin Functions and Selection Method
P35/TXD31
The pin function depends on bit TE in SCR3-1, bit SPC31 in SPCR, and bit
PCR35 in PCR3.
SPC31
TE
0
0
1
1
PCR35
0
1
*
Pin function
P35 input pin
P35output pin
TXD31 output pin
P34/RXD31
P33/SCK31
The pin function depends on bit RE in SCR3-1 and bit PCR34 in PCR3.
RE
0
1
PCR34
0
1
*
Pin function
P34 input pin
P34 output pin
RXD31 input pin
The pin function depends on bits CKE1, CKE0, and SMR31 in SCR3-1 and bit
PCR33 in PCR3.
CKE1
CKE0
0
1
*
*
*
0
1
COM31
0
1
*
PCR33
0
1
*
Pin function
P33 input pin P33 output pin
SCK31
output pin
SCK31
input pin
P32/RESO
P31/UD
The pin function depends on bit RESO in PMR3 and bit PCR32 in PCR3.
RESO
PCR32
0
1
0
1
*
Pin function
P32 input pin
P32 output pin
RESO output pin
The pin function depends on bit UD in PMR3 and bit PCR31 in PCR3.
UD
0
1
PCR31
0
1
*
Pin function
P31 input pin
P31 output pin
UD input pin
P30/PWM
The pin function depends on bit PWM in PMR3 and bit PCR30 in PCR3.
PWM
PCR30
0
1
0
1
*
Pin function
P30 input pin
P30 output pin
PWM output pin
*: Don’t care
150
ETC [ ETC ]
