Octagon 6000 Series, Руководство пользователя

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6-19
6000 Series user’s manual EZ I/O
mov bData,ah
mov cData,bl
}
Initialize EZ I/O (2)
Function: efh
Subfunction: 03h
Purpose: To set the directions and to program the initial values of
an EZ I/O port.
Calling registers: AH efh
AL
03h
DI Port A configuration
xxxxxxxx xxxxxxxxB
xxxxxxxx
Initial data for port A
xxxxxxxxB direction; 1->output, 0->input
BX Port B configuration
xxxxxxxx xxxxxxxxB
xxxxxxxx
Initial data for port B
xxxxxxxxB direction; 1->output, 0->input
CX Port C configuration
xxxxxxxx xxxxxxxxB
xxxxxxxx
Initial data for port C
xxxxxxxxB direction; 1->output, 0->input
DX ffffh
Return registers: Carry flag cleared if successful
Carry flag set if error
AL
Error code
Comments: This function is used to initialize the second EZ I/O (i.e.,
the EZ I/O that has the higher I/O address when two
EZ I/O chips are present on a board) before normal use.
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
asm {
mov ax,0ef03h
mov di,00ffh /*port A all outputs, init data=all 0’s */
mov bx,55ffh /*port B all outputs, init data=55h*/
mov cx,0000h /*port C all inputs*
mov dx,0ffffh
int 17h
}
Write EZ I/O (2)
Function: efh
Subfunction: 04h
Purpose: To write a value to an EZ I/O port.