Samsung C8278X ユーザーズマニュアル

 

 

 

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 F5H in set 1, bank 0. P5.0-P5.7 can serve as inputs (with or without pull-
up), as push-pull output or you can be configured the following functions. 

•  Low-nibble pins (P5.0-P5.3): SEG7−SEG4 
•  High-nibble pins (P5.4-P5.7): SEG3−SEG0 

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. You use control registers setting to 
select input (with or without pull-up) or push-pull output mode and enable the alternative functions. 

When programming this port, please remember that any alternative peripheral I/O function you configure using the 
port 5 control registers must also be enabled in the associated peripheral module. 

Port 5 Control Register, High Byte (P5CONH)

EBH, Set 1, Bank 1, R/W

.7

.6

.5

.4

.3

.2

.1

.0

MSB

LSB

P5.5/SEG2

P5.4/SEG3

P5CONH bit-pair pin configuration settings:

00

01

10

11

Push-pull output mode

Alternative function (SEG0-SEG3)

Input with pull-up resistor

Input mode

P5.6/SEG1

P5.7/SEG0