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ZBasic System Library
171
ZX Microcontroller Family
The analog value output by the DAC will be approximately equal to the 12-bit digital value set for each
channel (see the DAC() subroutine) divided by 4095 and multiplied by the reference voltage. The choice
of four reference voltages available is made by the least significant two bits of the mode parameter value.
For the PortA and PortB Aref Reference, the table below indicates the pin to which the desired reference
voltage should be applied.
DAC Reference Voltage Pin
ZX Device
Aref A
Aref B
ZX-24x
20, A.0
7, B.0
ZX-32a4
40, A.0
4. B.0
ZX-128a1
95, A.0
5, B.0
ZX-24xu
36, A.0
28, B.0
The status parameter, if supplied, receives a value to indicate success or failure of the call.
Example
Call OpenDAC(1, &H01) ' prepare for DAC output using AVcc reference
Call DAC(1, 300) ' set the DAC level to 300/4095*AVcc
Compatibility
This subroutine is not available in BasicX compatibility mode nor is it available on ATmega-based ZX
devices.
See Also
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