IBM AR-B3001, Руководство пользователя, Страница: 22 / 41

ACROSSER TECHNOLOGY
22
Function 1 - Read Input Data
Purpose
This function checks End of Conversion and returns the
analog input data if data is available. Before read data by
using function 1, ADC must be triggered by function 0.
Otherwise error code 2 will be returned.
Input Arguments
The following input arguments have to be initialized
before calling the function.
AH = 1, specifies function 1.
DX = The I/O port base address. Base address can be
located between 100H and 3FCH.
Returns
AL = 0, Good return.
= 1, Conversion is still in process.
= 2, ADC has not been triggered by function 0.
= 3, Analog input is out of range (-5V to +5V).
CX = Converted data. The returned data has the
following formats:
CH
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 SIGN AD11 AD10 AD9 AD8
CL
D7 D6 D5 D4 D3 D2 D1 D0
AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0