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8. I/O Ports
Port Mode Register 4 (PMR4)
Bit
NMOD7 NMOD6 NMOD5 NMOD4 NMOD3 NMOD2 NMOD1 NMOD0
Initial value
Read/Write
R/W
PMR4 is an 8-bit read/write register, used to select CMOS output or NMOS open drain output for
each port 2 pin.
Upon reset, PMR4 is initialized to H'00.
Bit n—NMOS Open-Drain Output Select (NMODn): This bit selects NMOS open-drain output
when pin P2
is used as an output pin.
n
Bit n: NMODn
Description
0
CMOS output
1
NMOS open-drain output
Note: n = 7 to 0
Rev.3.00 Jul. 19, 2007 page 186 of 532
REJ09B0397-0300
7
6
5
0
0
0
R/W
R/W
4
3
0
0
R/W
R/W
R/W
2
1
0
0
0
0
R/W
R/W
(initial value)
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