176
7.4
Port 3
7.4.1
Overview
Port 3 is an 8-bit input/output port which also functions as a data bus. It’s pin configuration is
shown in figure 7.3. Port 3 is a data bus in modes 1 to 5 (expanded modes) and a generic
input/output port in modes 6 and 7 (single-chip mode).
Pins in port 3 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair.
Port 3
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
P3 /D
7
6
5
4
3
2
1
0
15
14
13
12
11
10
9
8
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
P3 (input/output)
7
6
5
4
3
2
1
0
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
D (input/output)
15
14
13
12
11
10
9
8
Port 3 pins
Modes 6 and 7
Modes 1 to 5
Figure 7.3 Port 3 Pin Configuration
7.4.2
Register Descriptions
Table 7.5 summarizes the registers of port 3.
Table 7.5
Port 3 Registers
Address
*
Name
Abbreviation
R/W
Initial Value
H'EE002
Port 3 data direction register
P3DDR
W
H'00
H'FFFD2
Port 3 data register
P3DR
R/W
H'00
Note:
*
Lower 20 bits of the address in advanced mode
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