Power in the news
Power in a µcontroller
Let’s look at some nice pictures
from the ECE 3724 Chapter 8 PIC24 Startup
to look at power on the PIC24.
Power requirements, p. 11
- Stable power: VDD, VSS, &l VCAP
- Decoupling capacitors filter power supply to the chip
Clock options, p. 15-16
The slower the clock, the less power used.
- Several possibilites
- Internal oscillator
- External clock
- Means of varying the frequency
Reset, p. 25-26
The PIC24 can be reset in many ways.
- Program action
- bad instructions
- Reset (MCLR) input
- Power on / brown out
- Watchdog timer
- Interrupt (pin change) during sleep or idle mode
Watchdog Timer, p. 28-32
The watchdog timer can be used to save power, by putting
the processor asleep for short periods of time,
or to prevent software malfunctions.
The Pathfinder mission to Mars was
a watchdog timer.