Mikroelektronika MIKROE-742 데이터 시트

309

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

procedure Expander_Set_DirectionPortB(ModuleAddress: byte; Data_:
byte);

Nothing.

The function sets Port Expander's PortB direction.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot

tom of this page 

- 

Data_

: data to be written to the PortB direction register. Each bit corresponds 

to the appropriate pin of the PortB register. Set bit designates corresponding 
pin as input. Cleared bit designates corresponding pin as output. 

Port Expander must be initialized. See Expander_Init.

// Set Port Expander's PORTB to be input

Expander_Set_DirectionPortB(0,0xFF);

procedure Expander_Set_DirectionPortAB(ModuleAddress: byte;
Direction: word);

Nothing.

The function sets Port Expander's PortA and PortB direction.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot-

tom of this page 

- 

Direction

: data to be written to direction registers. Data to be written to the 

PortA direction register are passed in 

Direction's

higher byte. Data to be 

written to the PortB direction register are passed in 

Direction's

lower byte. 

Eachbit corresponds to the appropriate pin of the PortA/PortB register. Set bit 
designates corresponding pin as input. Cleared bit designates corresponding 
pin as output. 

Port Expander must be initialized. See Expander_Init.

// Set Port Expander's PORTA to be output and PORTB to be input
Expander_Set_DirectionPortAB(0,0x00FF);