Samsung S3C9228/P9228 사용자 설명서
I/O PORTS
S3C9228/P9228
9-16
PORT 6
Port 6 is an 4-bit I/O port with individually configurable pins. Port 6 pins are accessed directly by writing or
reading the port 6 data register, P6 at location EAH in page 0. P6.0-P6.3 can serve as inputs or as push-pull,
open-drain outputs. You can configure the following alternative functions with LCD port control register, LPOT:
reading the port 6 data register, P6 at location EAH in page 0. P6.0-P6.3 can serve as inputs or as push-pull,
open-drain outputs. You can configure the following alternative functions with LCD port control register, LPOT:
— Low-nibble pins (P6.0-P6.3): COM0-COM3
Port 6 Control Register (P6CON)
Port 6 has a 8-bit control register: P6CONH for P6.0-P6.3. A reset clears the P6CON registers to "00H",
configuring all pins to input mode. You use control registers setting to select input or output mode.
configuring all pins to input mode. You use control registers setting to select input or output mode.
Port 6 Control Register, Low Byte (P6CON)
FDH, Page 0, R/W
.7
.6
.5
.4
.3
.2
.1
.0
MSB
LSB
P6.1/COM2
P6.0/COM3
P6CON bit-pair pin configuration settings:
00
01
10
11
N-channel open-drain output mode
Input mode with pull-up
Push-pull output mode
Input mode
P6.2/COM1
P6.3/COM0
Figure 9-23. Port 6 Control Register (P6CON)