Can the P3.1 serial port RXD of STC be used as a normal external interrupt reception?

tangwei8802429

Can the P3.1 serial port RXD of STC be used as a normal external interrupt reception? [Copy link]

 

I saw that the pin is labeled INT. I tried to make it an external interrupt but failed. STC12C5A60S2 - WAKE_CLKO = 0x40; ES = 1; EA = 1; void uart_isr() interrupt 4 using 1 { if (RI) { RI = 0; if(PulseCnt == 0) TR1 = 1; //count start PulseCnt ++; } }

tangwei8802429

It is P3.0RXD, wrong number

bqgup

It cannot be used as an external interrupt. The pins for external interrupt are P32 and P33. P30 and P31 are the pins for serial port interrupt. These cannot be changed.

tangwei8802429

bqgup posted on 2018-10-27 21:47 It cannot be used as an external interrupt. The pins for external interrupt are P32 and P33. P30 and P31 are the pins for serial port interrupt. These cannot be changed

What does this mean? It can only be used as a wake-up?

huo_hu

It is an external interrupt, not a UART interrupt

ketose

Upstairs is right.

tangwei8802429

huo_hu posted on 2018-10-29 13:28 It is an external interrupt, not a UART interrupt

What do you mean? Do you mean it can be made into an external interrupt? But the external interrupts are only INT0 and INT1.

tangwei8802429

huo_hu posted on 2018-10-29 13:28 It is an external interrupt, not a UART interrupt

Its pin is marked as INT. How do you write the program? Can you explain it more clearly?

huo_hu

tangwei8802429 posted on 2018-11-5 16:56 Its pin is labeled INT. How to write the program? Can you explain it more clearly?

It is the same as the traditional 51 int0 and int1, which are all in the oldest books.

hehung

The serial port interrupt pin cannot be used as an external interrupt. The serial port interrupt pin can only be used as a serial port pin or a normal pin. External interrupts have special pins. Otherwise, why do we need external interrupt pins?

lgwd55

The P3.0 and 3.1 pins of STC are very important, as they are used as ports for downloading programs and as emulators for debugging under Keil software. Why do we need to use P3.0 and P3.1 when there are so many ports?

jinshenf7533967

lgwd55 posted on 2018-11-21 13:14 The P3.0 and 3.1 pins of STC are very important, as the download program port and as the emulator debugging under Keil software. Why do we need to use P3.0 and P3 when there are so many ports?

MCUs now have external interrupts, timer interrupts and serial port interrupts, etc. External interrupts are used for us to receive external signals, such as low level, high level trigger (infrared signal can also be set as interrupt receiving signal) to execute things first, timer interrupts must be operated with the internal setting timer, and when the timer time is reached, it interrupts what is being done. The serial port interrupt must have a transmitter and a receiver to complete the work, which is what we often call RX and TX, but what they complete is signal transmission, not a single high or low or level can make it work internally. Of course, if you learn more, you will find that there are also ADC interrupts, watchdog interrupts, etc., but the characteristics of the first three interrupts must be clearly distinguished.