| ??? 12/17/04 03:13 Read: times |
#83283 - Your are correct Responding to: ???'s previous message |
You haven't mentioned what latch device you are using - normally it would be something like a 74HCT573 or 373. Since you're using /PSEN (program store enable) to gate the eprom - it is used for code storage, if you wanted xdata storage you would use /RD You would normally have the same 5V for your cpu,latch and eprom. Everything else seems in order. I don't know why you're pondering this issue - there's many examples of how to do this on the web. The purpose of the reset supervisor is to give the cpu a 'clean' reset signal based on detecting the VCC voltage. These devices are better than using a capacitor and resistor for your reset. Many of the newer 8051 derivative have internal eeprom that relies on the VCC being above a certain voltage in order to operate correctly. The reset supervisor ensures this. |
| Topic | Author | Date |
| eprom | 01/01/70 00:00 | |
| None! | 01/01/70 00:00 | |
| RTFM! | 01/01/70 00:00 | |
| p87c52sbpn with a276308a | 01/01/70 00:00 | |
| WHAT ? | 01/01/70 00:00 | |
| As josé and neil said | 01/01/70 00:00 | |
| cruel and unusual | 01/01/70 00:00 | |
| Gimme | 01/01/70 00:00 | |
| No need to even search! | 01/01/70 00:00 | |
| No need to even search! | 01/01/70 00:00 | |
| Derivatives | 01/01/70 00:00 | |
| thanks people ! | 01/01/70 00:00 | |
| You need to do this | 01/01/70 00:00 | |
| Data sheets | 01/01/70 00:00 | |
| i am a lot better now ! | 01/01/70 00:00 | |
| reset controllers | 01/01/70 00:00 | |
| please correct me | 01/01/70 00:00 | |
| SEARCH | 01/01/70 00:00 | |
| Your are correct | 01/01/70 00:00 | |
| website? | 01/01/70 00:00 | |
| How to find stuff | 01/01/70 00:00 | |
| sdcc compiler | 01/01/70 00:00 | |
| External or internal | 01/01/70 00:00 | |
| 74138 | 01/01/70 00:00 | |
| Bible Time | 01/01/70 00:00 | |
| Bible Time - again | 01/01/70 00:00 | |
| change of processor | 01/01/70 00:00 | |
| Reading Time | 01/01/70 00:00 | |
| no internal rom | 01/01/70 00:00 | |
| What ? | 01/01/70 00:00 | |
| Why not? | 01/01/70 00:00 | |
| external address/data bus | 01/01/70 00:00 | |
| Yes, that IS true. | 01/01/70 00:00 | |
| Supersonic goalposts! | 01/01/70 00:00 | |
| finally ! | 01/01/70 00:00 | |
| How to post code | 01/01/70 00:00 | |
| External storage of code | 01/01/70 00:00 | |
Some other references | 01/01/70 00:00 |