| ??? 08/01/05 08:03 Read: times |
#98555 - bible study time? Responding to: ???'s previous message |
Matheus Nogueira Martino said:
This code is not functioning, the ports P0 and P2 become at a high level all the time How do you know? Have you checked this with an oscilloscope or logic analyser? Have you tried reading-back the values from the external memory? Look at Figure 30, External Data Memory Write Cycle in Chapter 3 of the 8051 "bible" - 80C51 Family Hardware Description: http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf Note that the data to be written to the external memory is present on the bus for only a short time - if you're expecting to see it on some LEDs, or a voltmeter, you will get the results you described! See http://www.8052.com/forum/read.phtml?id=89910 for the other "bible" links. |
| Topic | Author | Date |
| Accessing External RAM | 01/01/70 00:00 | |
| Hardware! | 01/01/70 00:00 | |
| I seted the hardware | 01/01/70 00:00 | |
| ExtRAM | 01/01/70 00:00 | |
RTFDS | 01/01/70 00:00 | |
| bible study time? | 01/01/70 00:00 |