January
2006, Issue 186
Portable
Web Server
Renesas
M16C Design Contest 2005 Entry
RS-232
INTERFACE
The
RS-232 interface connects an external modem to the web
site module’s UART. The interface circuitry consists
of a fairly generic charge-pump voltage converter, providing
Rx, Tx, RTS, and CD lines. The RTS line provides hardware
flow control to stop the modem from overflowing the
input buffer during high-speed transmission bursts.
The M32C/84’s UART0 peripheral is used to communicate
with the modem.
