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KS86C6004/C6008/P6008 MICROCONTROLLER (Preliminary Spec)
PORT 3
Port 3 is a 4-bit, bit-configurable, general I/O port. It is designed for high-current functions such as LED drive.
A reset configures P3.0–P3.3 to Schmitt trigger input mode. Using the P3CON register (E5H), you can
alternatively configure the port 3 pins as n-channel, open-drain outputs. P3.3 can be used to system clock output
(CLO) port.
MSB
PORT3 CONTROL REGISTER (P3CON)
.7
.6
.5
P3.3/CLO
P3.2
7
6
0
0
0
1
1
0
1
1
5,3,1
4,2,0
0
x
1
0
1
1
Figure 9-7. Port 3 Control Register (P3CON)
E5H, R/W
.4
.3
.2
P3.1
Port Mode Selection (Pin 3.3)
Schmitt trigger input
System Clock output (CLO) mode.
CLO comes from System clock circuit.
Push-pull output
N-CH Open drain output
Port Mode Selection (Pin 3.2-Pin 3.0)
Schmitt trigger input
Push-pull output
N-CH open drain output
.1
.0
LSB
P3.0
I/O PORTS
9-7
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