I am looking for small low cost processor ideally with 4 16 bit capture on interrupt timers. Its to measure the minimum bit width of 4 RS232 sources, which can have a minimum bit width of 8.2uS. This has to be done continuously with the results filtered etc with resulting bit width converted to its corresponding baud rate and then an equivalent 4 bit number which is output to a IO port. Therefore the processor requires 20 I/O lines.
Any ideas etc would be appreciated