Samsung S3P80C5 User Manual page 214

S3P80C5/C80C5/C80C8
NOTE:
Figure 9-2. S3P80C5/C80C5/C80C8 I/O Port 1 Data Register Format
Port1 Pull-up Resistor Enable Register (P1PUR)
MSB .7 .6 .5
P1.7 P1.6 P1.5
Pull-up resistor enable bit:
0 = Disable pull-up resistor
1 = Enable pull-up resistor
Pull-up resistors can be assigned to the port 2 pins, P2.0, P2.1 and P2.2
by marking the appropriate the port 2 control register, P2CON.
ECH, R/W
.4 .3 .2 .1
P1.4 P1.3 P1.2 P1.1 P1.0
.0 LSB
I/O PORTS
9-3