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SYNCHRONOUS SERIAL I/O UNIT

The SSIO Unit can be operated either by using a polling method or through interrupts.

• Figure 13-12 shows a basic flowchart for using the polling method to receive data through

• Figure 13-13 shows a basic flowchart for the Interrupt Service Routine necessary when

using interrupts to receive data through the SSIO. If interrupts are used, follow the below

sequence for initialization:

1. Initialize the SSIO.

2. Initialize the interrupts - ICU initialization, Interrupt Service Routine, etc.

3. Unmask the interrupts on the ICU.

Figure 13-12. Receive Data by Polling

Initialize SSIO

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