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UM0404
Parallel ports
DP3 (FFC6h / E3h)
SFR
Reset Value: 0000h
ODP3 (F1C6h / E3h)
ESFR
Reset Value: 0000h
6.5.1 Alternate
functions of Port3
The pins of Port3 are used for various functions which include external timer control lines,
the two serial interfaces and the control lines BHE / WRH and CLKOUT.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DP3.
15
-
DP3.
13
DP3.
12
DP3.
11
DP3.
10
DP3.
9
DP3.
8
DP3.7 DP3.6 DP3.5 DP3.4 DP3.3 DP3.2 DP3.1 DP3.0
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Bit
Function
DP3.y
Port direction register DP3 bit y
’0’: Port line P3.y is an input (high-impedance).
’1’: Port line P3.y is an output.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-
-
ODP3.
13
-
ODP3.
11
ODP3.
10
ODP
3.9
ODP
3.8
ODP3
.7
ODP3
.6
ODP3
.5
ODP3
.4
ODP3
.3
ODP3
.2
ODP3
.1
ODP3
.0
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Bit
Function
ODP3.y
Port Open Drain control register ODP3 bit y
’0’: Port line P3.y output driver in push-pull mode.
’1’: Port line P3.y output driver in open drain mode.