Mikroelektronika MIKROE-350 Data Sheet

298

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure Expander_Set_DirectionPortAB(dim ModuleAddress as
byte, dim Direction as word)

Nothing.

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

Parameters : 

- 

ModuleAddress:

Port Expander hardware address, see schematic at the 

bottom 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.  
Each bit 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)

sub procedure Expander_Set_PullUpsPortA(dim ModuleAddress as

byte, dim Data_ as byte)

Nothing.

The function sets Port Expander's PortA pull up/down resistors.

Parameters : 

- 

ModuleAddress:

Port Expander hardware address, see schematic at the 

bottom of this page 

- 

Data_:

data for choosing pull up/down resistors configuration. Each bit 

corresponds to the appropriate pin of the PortA register. Set bit enables pull-up 
for corresponding pin. 

Port Expander must be initialized. See Expander_Init.

' Set Port Expander's PORTA pull-up resistors
Expander_Set_PullUpsPortA(0, 0xFF)