Filter
Top Products
I/O PORTS S3C8245/P8245/C8249/P8249
9-14
PORT 5
Port 5 is an 8-bit I/O port with individually configurable pins. Port 5 pins are accessed directly by writing or reading
the port 5 data register, P5 at location FBH in set 1, bank 0. P5.0–P5.7 can serve as inputs (with without pull-ups),
as output (open drain or push-pull). And, they can serve as segment pins for LCD also.
Port 5 Control Registers
Port 5 has two 8-bit control registers: P5CONH for P5.4–P5.7 and P5CONL for P5.0–P5.3. A reset clears the
P5CONH and P5CONL registers to “00H”, configuring all pins to input mode.
Output mode, push-pull
Port 5 Control Register, High Byte (P5CONH)
EEH, Set 1, Bank 1, R/W
.7 .6 .5 .4 .3 .2 .1 .0MSB LSB
P5.6/SEG30
P5.5/SEG29
P5.4/SEG28
P5CONH bit-pair pin configuration settings:
00
01
10
11
Input mode, pull-up
P5.7/SEG31
Input mode
Opendrain output mode
NOTE:
If LCD is enabled by LCON.7, SEG signal go out
otherwise port 5 I/0 can be selected.
Figure 9-14. Port 5 High-Byte Control Register (P5CONH)