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- The Clock Generator
-
- The clock generator in MacBreadboard can operate in one of four
- modes. The modes are selectable from the 'Clock' menu, and
- identifiable by a check mark in the menu and a unique picture on
- the trainer. Typical frequencies generated are 10Hz and lower.
-
- • Free-Run - a continuous square wave signal is generated.
- The frequency is adjustable by sliding the simulated control
- right or left.
-
- • Positive pulse - In this mode, a button is shown in the clock
- function area of the trainer. Pressing the button causes a
- clock 'pulse' to be generated. The pulse is initially low, then
- it goes high and finally it returns low again. The frequency
- is determined by the Free-Run clock's setting. A step function
- may be simulated by pressing and holding the mouse button.
- When the button is released, the clock output returns to its
- initial state.
-
- • Negative pulse - Similar to the positive pulse except that the
- initial and final states of the clock are HIGH, not low.
-
- • Step - Or half pulse. Clicking on the step button generates
- a state change in the clock. If it was HIGH, it is now LOW
- and vice-versa. (Holding the mouse button down has no effect
- in step mode.)
-