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Section 8 I/O Ports
Bit 2: P2
/SO
pin function switch (SO1)
2
1
This bit selects whether pin P2
Bit 2
SO1
Description
0
Functions as P2
1
Functions as SO
Bit 1: P2
/SI
pin function switch (SI1)
1
1
This bit selects whether pin P2
Bit 1
SI1
Description
0
Functions as P2
1
Functions as SI
Bit 0: P2
/SCK
pin function switch (SCK1)
0
1
This bit selects whether pin P2
Bit 0
SCK1
Description
0
Functions as P2
1
Functions as SCK
4. Port Mode Register 4 (PMR4)
Bit
7
NMOD7
Initial value
0
Read/Write
R/W
PMR4 is an 8-bit read/write register that controls whether individual port 2 pins are CMOS
outputs or NMOS open-drain outputs when 1 is set in PCR2.
Upon reset, PMR4 is initialized to H'00.
Rev. 6.00 Aug 04, 2006 page 216 of 680
REJ09B0145-0600
/SO
is used as P2
2
1
I/O pin
2
output pin
1
/SI
is used as P2
1
1
1
I/O pin
1
input pin
1
/SCK
is used as P2
0
1
I/O pin
0
I/O pin
1
6
5
NMOD6
NMOD5
NMOD4
0
0
R/W
R/W
or as SO
.
2
1
or as SI
.
1
or as SCK
.
0
1
4
3
2
NMOD3
NMOD2
0
0
0
R/W
R/W
R/W
(initial value)
(initial value)
(initial value)
1
0
NMOD1
NMOD0
0
0
R/W
R/W
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