Datasheet

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 228 of 680
REJ09B0145-0600
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
3
/IRQ
0
The pin function depends on bit IRQ0 in PMR3.
IRQ0 0 1
Pin function P4
3
input pin IRQ
0
input pin
P4
2
/TXD
32
The pin function depends on bit TE in SCR3-2, bit SPC32 in SPCR, and bit
PCR4
2
in PCR4.
SPC32 0 1
TE 0 1
PCR4
2
0 1 *
Pin function P4
2
input pin P4
2
output pin TXD
32
output pin
P4
1
/RXD
32
The pin function depends on bit RE in SCR3-2 and bit PCR4
1
in PCR4.
RE 0 1
PCR4
1
0 1 *
Pin function P4
1
input pin P4
1
output pin RXD
32
input pin
P4
0
/SCK
32
The pin function depends on bits CKE1 and CKE0 in SCR3-2, bit COM32 in
SMR32, and bit PCR4
0
in PCR4.
CKE1 0 1
CKE0 0 1 *
COM32 0 1 **
PCR4
0
01**
Pin function P4
0
input pin P4
0
output pin SCK
32
output pin
SCK
32
input pin
*: Don’t care