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MacWorld 1999 February
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MacBreadboard DEMO 1.1
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MacBreadboard DEMO 1.1.rsrc
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TEXT_406_clock.txt
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1998-12-03
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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.)