Mikroelektronika MIKROE-742 데이터 시트

308

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

procedure Expander_Write_PortAB(ModuleAddress: byte; Data_:
word);

Nothing.

The function writes word to Port Expander's ports.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot

tom of this page 

- 

Data_

: data to be written. Data to be written to PortA are passed in Data's 

higher byte. Data to be written to PortB are passed in Data's lower byte 

Port Expander must be initialized. See Expander_Init.

Port Expander's PortA and PortB should be configured as outputs. See
Expander_Set_DirectionPortA, Expander_Set_DirectionPortB and
Expander_Set_DirectionPortAB routines.

// Write a byte to Port Expander's PORTA and PORTB 

...
Expander_Set_DirectionPortAB(0,0x0000);        // set expander's

porta and portb to be output

...
Expander_Write_PortAB(0, 0xAA55);

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

Nothing.

The function sets Port Expander's PortA direction.

Parameters : 

- 

ModuleAddress

: Port Expander hardware address, see schematic at the bot

tom of this page 

- 

Data_

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

to the appropriate pin of the PortA 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
Expander_Set_DirectionPortA(0,0x00);