Summary of How do hardware timers work?

00:00:00 - 00:30:00

This video explains how hardware timers work, and how a program can use them to create a delay or execute a task periodically. The video demonstrates how to use a subroutine to toggle a LED on a timer every 250 milliseconds.

• 00:00:00 This video explains how hardware timers work, and how a computer can produce a precisely timed delay. One option for creating a delay is to use the noop instruction, which takes two clock cycles to execute. If we want to create a longer delay, we can use a loop with a bunch of noops. Alternatively, we could use a subroutine to create a delay. Either way, we need to know how many clock cycles each instruction takes to run, in order to create a precise delay.
• 00:05:00 Hardware timers work by using registers in a chip to control the timer's mode and count. The timer can be set to countdown or one-shot mode.
• 00:10:00 The video discusses how hardware timers work, and explains that there are two modes: delay mode, which delays for a fixed amount of time, and free run mode, which delays indefinitely.
• 00:15:00 Hardware timers work by continuously interrupting the processor. To detect and handle the interrupts, the interrupt handler clears the interrupts and updates the timer.
• 00:20:00 Hardware timers work by counting the number of ticks that have passed, and then doing something (usually turning on a light) based on that number.
• 00:25:00 This video demonstrates how hardware timers work, and how to use a subroutine to toggle a LED on a timer every 250 milliseconds. The video also shows how to use a variable to store the last time the LCD was updated.
• 00:30:00 This video explains how hardware timers work on a computer, and shows how a program can use them to periodically update a display or execute a task.