Samsung S3C8275X User Manual
Page 249
I/O PORTS
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
9-14
Port 3 Control Register, Low Byte (P3CONL)
EEH, Set 1, Bank 0, R/W
.7
.6
.5
.4
.3
.2
.1
.0
MSB
LSB
P3.1/SEG22
P3.0/SEG23
P3CONL bit-pair pin configuration settings:
00
01
10
11
Alternative function (SEG20-SEG23)
Input mode
N-channel open-drain output mode
Push-pull output mode
P3.3/SEG20 P3.2/SEG21
Figure 9-17. Port 3 Low Byte Control Register (P3CONL)
Port 3 Pull-up Control Register (P3PUR)
EFH, Set 1, Bank 0, R/W
.7
.6
.5
.4
.3
.2
.1
.0
MSB
LSB
P3PUR bit configuration settings:
0
1
Enable pull-up resistor
Disable pull-up resistor
P3.1
P3.0
P3.3
P3.2
P3.5
P3.4
P3.7
P3.6
NOTE:
A pull-up resistor of port 3 is automatically disabled when the
corresponding pin is selected as push-pull output or alternative
function.
Figure 9-18. Port 3 Pull-up Control Register (P3PUR)