| ??? 02/23/05 13:51 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#88212 - you requested an opinion Responding to: ???'s previous message |
Memory mapping:
24K Rom 24K Ram 1 address for enable 8255 where 8255 is connect for DAC and ADC interfacing 1 address for LCD Port 1 for Keypad Why are you using external ROM, you lose ISP. Anyway, are you only going to program it ONCE? (ROM) You have "sold" the ability to expand the system by using only 24k of dirt cheap hardware (RAM/ROM). Get rid of the darn 8255 it will give you more problems than solutions. Once you find out you need a faster uC, the 8255 will croak. BTW same for the LCD. Where is the serial interface? I suggest you use a chip like the Philips P89C668 or a SILabs f12x these give you enough internal flash and RAM. Thus a much simpler board and ISP and all ports avilable for I/O How to begin compile every program code together into ROM? You can not "compile every program code together into ROM", you load it into ROM/PROM/EPROM/Flash. Again, as above, why not use an ISP chip. The board is general. Not a special purpose system. I feel struggle to cruch the whole system together. Is it monitor program can become a good reference? Opinion: forgert monitor and all that jazz, get a SILabd f12x developemnt system, you will have ICE functionality ISP 128k Flash, 8k RAM, a/d, d/a, comparators and more. Erik |
| Topic | Author | Date |
| Request Opinion on simple board software | 01/01/70 00:00 | |
| Linker | 01/01/70 00:00 | |
| Hardware | 01/01/70 00:00 | |
| How to Map DAC ADC into external RAM? | 01/01/70 00:00 | |
| Due? | 01/01/70 00:00 | |
| Re: How to map ADC and DAC | 01/01/70 00:00 | |
| Yup, interface DAC or ADC to port1 | 01/01/70 00:00 | |
| Alternatively | 01/01/70 00:00 | |
| and | 01/01/70 00:00 | |
| My tools | 01/01/70 00:00 | |
| Tools | 01/01/70 00:00 | |
| My tools | 01/01/70 00:00 | |
| A better link to ASEM51 | 01/01/70 00:00 | |
once upon a time | 01/01/70 00:00 | |
| you requested an opinion | 01/01/70 00:00 |