Omega Engineering CIO-DAC16, CIO-DAC08 user manual Msb

In summary form, the registers and their function are listed in the following table. Each register has eight bits which can constitute a byte of data or eight individual read/write functions. The CIO-DAC08 has 8 pairs of register (Base + 0 through Base + 15) and the CIO-DAC16 has 16 pairs of register (Base + 0 through Base + 31).

Table 4-2. Register Map

ADDRESS	WRITE FUNCTION	READ FUNCTION
BASE + 0	D/A 0 Least Significant Byte	Intiate simultaneous update
BASE + 1	D/A 0 Most Significant Nibble	Intiate simultaneous update
BASE + 2	D/A 1 Least Significant Byte	Intiate simultaneous update
BASE + 3	D/A 1 Most Significant Nibble	Intiate simultaneous update
BASE + 4	D/A 2 Least Significant Byte	Intiate simultaneous update
BASE + 5	D/A 2 Most Significant Nibble	Intiate simultaneous update
BASE + 6	D/A 3 Least Significant Byte	Intiate simultaneous update
BASE + 7	D/A 3 Most Significant Nibble	Intiate simultaneous update
BASE + 8	D/A 4 Least Significant Byte	Intiate simultaneous update
...
BASE + ##	And so on for each DAC	Same

The DAC16 contains 32 registers (16 register pairs). The DAC08 contains 16 registers. Each register-pair controls one D/A output.

Each DAC has two 8-bit registers which are used to control it. The first register contains the least significant eight bits of D/A code and should be written first.

7	6	5	4	3	2	1	0
D5	D6	D7	D8	D9	D10	D11	D12
							(LSB)

The second register contains the most significant four bits of D/A code and should be written to second. A write to this register updates the output of the D/A with all 12 bits of the D/A code contained in the two registers. If the XFER jumper is set for the DAC, no update will occur until a read of any one of the DAC registers is executed. Upon a read, all DACs set for simultaneous update (XFER jumper set) will update together.

7	6	5	4	3	2	1	0
X	X	X	X	D1	D2	D3	D4
				(MSB)

10