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8. I/O Ports
8.5.3
Pin Functions
Table 8.12 shows the port 4 pin functions.
Table 8.12 Port 4 Pin Functions
Pin
Pin Functions and Selection Method
P4
/IRQ
The pin function depends on the IRQ0 bit setting in PMR2.
3
0
IRQ0
Pin function
P4
/TXD
The pin function depends on bit TE in SCR3 and bit PCR4
2
TE
PCR4
Pin function
P4
/RXD
The pin function depends on bit RE in SCR3 and bit PCR4
1
RE
PCR4
Pin function
P4
/SCK
The pin function depends on bits CKE1 and CKE0 in SCR3, bit COM in SMR,
0
3
and bit PCR4
CKE1
CKE0
COM
PCR4
Pin function
Legend: * Don't care
Rev.3.00 Jul. 19, 2007 page 196 of 532
REJ09B0397-0300
0
2
P4
input pin
2
0
1
P4
input pin
1
in PCR4.
0
0
0
P4
input
0
pin
0
P4
input pin
3
0
1
P4
output pin
2
0
1
P4
output pin
1
0
0
0
1
P4
output
0
pin
1
IRQ
input pin
0
in PCR4.
2
1
*
TXD output pin
in PCR4.
1
1
*
RXD input pin
1
1
*
*
SCK
output
SCK
3
3
pin
pin
1
*
*
*
input
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