Omega-engineering OME-A8111 Manual do Utilizador descarregar pdf (Página 26)

2.8 D/A Conversion

The OME-A-8111 provides two 12-bit D/A converters. Before using the

D/A conversion function, user should notice the following issues:

z D/A output register, BASE+4/BASE+5/BASE+6/BASE+7 (sec. 2.4.3).

z JP1/JP2 selects internal/external reference voltage (sec. 2.4.1).

NOTE: The DA output latch registers are designed as a “double buffered” structure. The

user must send the low byte data first, then send the high byte

data to store the DA 12-bit digital data. If the user only sends the high byte

data, then the low byte data will be still the previous value. Also, if the user sends high byte

first then sends low byte, the low byte data of DA is still held in the previous one.

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