| ??? 12/08/05 22:32 Read: times |
#104924 - Yes, there are problems Responding to: ???'s previous message |
Erik Malund said:
do i still have the same problem?
if the problem you refer to is no code memory, you may. some 80C52s can be modified (Flash/EPROM) some can not (OTP) If you use 89C52 you should be OK; HOWEVER, why not go for an ISP chip such as the P89V51Rx2. Erik PS you are NOT OK re the 232 not having a ground pin. In addition to what Erik has mentioned, use of the 80C52 also does not solve the bus contention problem between your memory and the buffers used for the switch interfaces. Furthermore, if your microcontroller does in fact have internal program storage and you want to use it, you must tie /EA to VCC to tell the microcontroller to actually execute from it; you still have it tied to ground. --Sasha Jevtic |
| Topic | Author | Date |
| 8052 with a decoder - help! | 01/01/70 00:00 | |
| in addition .. | 01/01/70 00:00 | |
| can not work ! | 01/01/70 00:00 | |
| Program store? | 01/01/70 00:00 | |
| 8052 with a decoder - not a -31 | 01/01/70 00:00 | |
| im sorry :( | 01/01/70 00:00 | |
| if the problem you refer to is no code m | 01/01/70 00:00 | |
| ok | 01/01/70 00:00 | |
| The ground pin | 01/01/70 00:00 | |
| Yes, there are problems | 01/01/70 00:00 | |
| grounded | 01/01/70 00:00 | |
| picture | 01/01/70 00:00 | |
| No picture | 01/01/70 00:00 | |
| thoguht so .. | 01/01/70 00:00 | |
| Tristate latch output enable | 01/01/70 00:00 | |
| YOU ARE GOD! | 01/01/70 00:00 | |
| i am curious .. | 01/01/70 00:00 | |
| Welcome to embedded systems | 01/01/70 00:00 | |
| Thanks A Lot | 01/01/70 00:00 | |
| WHAT memory??? | 01/01/70 00:00 | |
| RAM | 01/01/70 00:00 | |
| it is .. | 01/01/70 00:00 | |
| another pic | 01/01/70 00:00 | |
| Another bad picture | 01/01/70 00:00 | |
| updated schematic | 01/01/70 00:00 | |
| AIM | 01/01/70 00:00 | |
| Look at U8 | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 | |
| KISS | 01/01/70 00:00 | |
| New problems ... | 01/01/70 00:00 | |
| picture | 01/01/70 00:00 | |
| Switches | 01/01/70 00:00 | |
| here you go sasha | 01/01/70 00:00 | |
| sry here .. | 01/01/70 00:00 | |
| Not clear | 01/01/70 00:00 | |
| if this is accurate, you are trying to r | 01/01/70 00:00 | |
| Looks ok | 01/01/70 00:00 | |
| the '244 output is connected NOT to a | 01/01/70 00:00 | |
| But wait, there's more | 01/01/70 00:00 | |
| So, how are they connected? | 01/01/70 00:00 | |
| New Questions | 01/01/70 00:00 | |
| 5.7V | 01/01/70 00:00 | |
| I have no recollection of asking about a | 01/01/70 00:00 | |
| Pull ups are definitely a good idea | 01/01/70 00:00 | |
| Look For... | 01/01/70 00:00 | |
| here .. | 01/01/70 00:00 | |
Ratings | 01/01/70 00:00 |