Mikroelektronika MIKROE-350 データシート

296

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure Expander_Write_PortAB(dim ModuleAddress as byte,
dim Data_ 

as word)

Nothing.

The function writes word to Port Expander's ports.

Parameters : 

- 

ModuleAddress:

Port Expander hardware address, see schematic at the 

bottom 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)