ballast definition electrical

5.2 Medium Priority Function to scan LED displays Display flashing function for the alarm 12-hour display function for time 24-hour display function for time PM indicator display function

5.3 Low Priority 60-Hz Fail/Recovery monitoring function Control input monitoring function Debounce function Toggle 12/24 hour mode Alarm on/off toggling function Snooze function

ballast definition electrical

6. Snooze mode 6.1 High Priority 60-Hz monitoring function Timeincrementfunctionbasedon60-Hzpowerlinetimebase Snooze function Alarm control function

6.2 Medium Priority Function to scan LED displays 12-hour display function for time 24-hour display function for time PM indicator display function

6.3 Low Priority 60-Hz Fail/Recovery monitoring function Control input monitoring function Debounce function Toggle 12/24 hour mode Alarm on/off toggling function

ballast definition electrical

7. Power fail mode 7.1 High Priority Timeincrementfunctionbasedon60Hzpowerlinetimebase 60-Hz monitoring function

7.2 Medium Priority Function to scan LED displays Display blanking function for operation from internal clock time base

ballast definition electrical

7.3 Low Priority 60-Hz Fail/Recovery monitoring function Time increment function based on internal clock time base

8. Error mode 8.1 High Priority 60-Hz monitoring function

When this happens, take the design back a step or two in the methodology and try something different. Because the design notes for the design detail every decision in the process, it is a simple process to back up and take the design in a different direction to avoid a problem.

If the problem can’t be avoided, the designer need not despair, there are other solutions for avoiding, recognizing, and recovering from state lock conditions. Unfortunately, they are not as simple as just changing a protocol, and they will require some additional overhead in the design, so the discussion on their operation will be tabled until the component phase of the design.

For now, the designer should note the problem on the data flow diagram, so it can be addressed in a later phase of the design.

Once all of the potential state lock conditions have been addressed, the variable list should be updated with the selection of communications protocol. Any pathways that still have the potential for state lock should be identified and highlighted with a note concerning corrective action later in the design.

The variable list for our alarm clock example is included in Table 3-3 below , with its associated data flow diagram in Figure 3.12 earlier.

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