| ??? 11/09/07 19:12 Read: times |
#146823 - Basics Responding to: ???'s previous message |
Tim Brown said:
I'm currently taking a class that teaches assembly and c programming for microcontrollers. We are using pre-made boards and loading our code onto them. I'd like to make my own setup so that I can experiment.
I have acquired a P89LPC925 and a LTC1385. My questions are basic but go as following: 1)As a beginner should I use these parts or buy something different? Those should be fine, I'm guessing it's a 3V3 device. I personally would start with 5V stuff. 2)Is a crystal necessary? From what I can tell most chips have an internal clock and the crystal is for timing and serial port communication. No, but I would start out with one at 11.059 MHz. The user manual might be helpfull if you don't have it. http://www.keil.com/dd/docs/d...24_925.pdf 3)Can anyone provide some basic schematics for the proper way to wire these. Preferably, with a same 20 pin controller. I've been reading datasheets but I'm not always sure what the pins are since they'll have multiple functions. Maybe later. 4)What are some other hardware that is needed? I know of a power regulator, but what is needed for this. DC output wall wart, voltage regulator, decoupling caps, filter caps. A reset supervisor like a DS1812, but for 3V3. Charge pump caps for LTC1385. I've tried to do some research but I thought this forum might help. Thanks, Tim Had to cut it short, got some stuff to take care of. Jon |
