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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.
OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 24