S3C9484 Datasheet, PDF (147/251 Pages) Samsung semiconductor – 8-bit CMOS Microcontroller Revision 1

I/O PORTS
S3C9484/C9488/F9488
MSB
Port 0 Pull-up Resistor Control Register (P0PUR)
D2H, R/W, Reset value:FFH
.7 .6 .5 .4 .3 .2 .1 .0 LSB
P1.7
P1.0
P0.6
P0.1
P1.5
P1.2
P1.4 P1.3
P0PUR Pin Configuration Settings:
0 Pull-up resistor disable
1 Pull-up resistor enable
Figure 9-3. Port 0 Pull-up Resistor Control Register (P0PUR)
PORT 1
Port 1 is an 8-bit I/O port that you can use two ways:
— General-purpose I/O
— Alternative function
Port 1 is accessed directly by writing or reading the port 1 data register, P1 at location E1H.
Port 1 Control Register (P1CONH, P1CONL, P1PUR)
Port 1 pins are configured individually by bit-pair settings in three control registers located:
P1CONL(low byte, E9H), P1CONH(high byte, E8H) and P1PUR(D3H).
When you select output mode, a push-pull circuit is configured. In input mode, many different selections are
available:
— Input mode.
— Push-pull output mode
— Alternative function: LCD ‘COM’ signal output – COM0, COM1, COM2, COM3
— Alternative function: TBPWM output
— Alternative function: BUZ output
— Alternative function: ADC input mode – ADC0, ADC1, ADC2, ADC3
9-6