Distingusihing between Asynchronous and Synchronous modes in USART

[Jason Jordon]

A very basic question in PIC interfacings: in what ways can one utilize and distinguish between synch and asynch modes in a PIC microcontroller.

Which one is better for RS232 mode?

Thanks!!!

[AJISH ALFRED]

Hi Jason,

The synchronous mode requires a dedicated CLOCK pin for synchronizing the devices, whereas the asysnchronous mode achieve syncronization without a CLOCK pin by sending synchronization bits.

If your RS232 port has 25 pins then it can do both synchronous and asynchronous transmission and reception, if there is only 9 pins then asynchronous mode is only possible

[Jason Jordon]

so here is a silly one: why two types of RS232 connectors, Alfred?

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