User`s guide

Operation Theorem

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Operation Theorem

The chapter describe the operation theorem of ACL-8111. The

functions include the A/D conversion, D/A conversion, and digital I/O.

The operation theorem can help you to understand how to manipulate

and to program the ACL-8111.

4.1 A/D Conversion

Before programming the ACL-8111 to perform the A/D conversion, you

should understand the following issues:

• A/D conversion procedure

• A/D trigger mode

• A/D data transfer mode

• Signal Connection

4.1.1 A/D Conversion Procedure

The A/D conversion is starting by a trigger source, then the A/D

converter will start to convert the signal to a digital value. The ACL-

8111 provides three trigger modes, see section 4.1.2.

While A/D conversion, the DRDY bit in A/D data register is cleared to

indicate the data is not ready. After conversion being completed, the

DRDY bit will return to high (1) level. It means users can read the

converted data from the A/D data registers. Please refer section 3.2 for

the A/D data format.

The A/D data should be transferred into PC's memory for further using.

The ACL-8111 provides three data transfer modes that allow users to