hi,

reading ADuC814 I have found that the derivative has next feature:

The ADuC814 has a high speed ADC to SPI interface data capture logic implemented on-chip. Once configured, this logic transfers the ADC data to the SPI interface without the need for CPU intervention.


So if you switch your software to data transfer via SPI then you may obtain baudrate up to 247 kHz (read manual for details). Think about it.

Regards,
Oleg