| ??? 12/01/04 14:52 Read: times |
#82295 - The difference is Responding to: ???'s previous message |
"the BIBLE" says serial port interrupt is generated by RI and TI. Actually, an interrupt is generated only if the ES bit is set in the Interrupt Enable (IE) register - see fig 18 on p17 of the 80C51 Family Hardware Description (chapter 3 of the "bible" for the 8051): http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf It seems to be a quite the same way of original one I posted the last time. What's the difference between two of them? In your original post, your main code would just "hang" in a loop waiting indefinitely for TI to be set: while(!TI); // The processor is effectively "hung" here
// it cannot do any useful work until TI is set;
// it is simply marking time, wasting instruction cycles!
TI = 0;
SBUF = date;The whole point of using interrupts is that you do not have to hang the whole processor like this; as I explained before, your main process can get on with other things - it lets ISR handle the tedious detail of detecting when each byte finishes & loading the next one.
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| Topic | Author | Date |
| THE TIME OF TI | 01/01/70 00:00 | |
| Bitrate | 01/01/70 00:00 | |
| interrupt-driven | 01/01/70 00:00 | |
| Why interrupt driven? | 01/01/70 00:00 | |
| UART Serial Port Interrupt | 01/01/70 00:00 | |
| all the above | 01/01/70 00:00 | |
| UART communication by UART interrupt | 01/01/70 00:00 | |
| just TI=1 | 01/01/70 00:00 | |
| serial interrupt in adc interrupt | 01/01/70 00:00 | |
| start with something simple | 01/01/70 00:00 | |
| misunderstand behaviour | 01/01/70 00:00 | |
| See the examples | 01/01/70 00:00 | |
| not has to, but can | 01/01/70 00:00 | |
| The difference is | 01/01/70 00:00 | |
| " | 01/01/70 00:00 | |
| He's right | 01/01/70 00:00 | |
| How the 8051 UART works | 01/01/70 00:00 | |
| The TI-bit Set Time | 01/01/70 00:00 | |
| no, at the middle | 01/01/70 00:00 | |
| The Transmitter Part, Actually | 01/01/70 00:00 | |
| Setting of TI | 01/01/70 00:00 | |
| sometimes chip designers listen | 01/01/70 00:00 | |
| So, Erik | 01/01/70 00:00 | |
| where does it happen | 01/01/70 00:00 | |
| Mode 1 TI timing. | 01/01/70 00:00 | |
| How to post code | 01/01/70 00:00 | |
RS485 & bus turnaround | 01/01/70 00:00 |