Octagon PC-510, Руководство пользователя

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11-9
PC-510 user’s manual EZ I/O
AL 02h
xxxxxxxx Data for port C
DX ffffh
Return registers: Carry flag cleared if successful
AL Port A data
Ah Port B data
BL Port C data
Carry flag set if error
AL Error code
Comments: This function is used to read from the first 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).
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
unsigned char aData, bData, cData;
asm {
mov ax,0ef02h
mov dx,0ffffh
int 17h
mov aData,al
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 00h
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