Hi everybody!
I'm building a smartcard application using AT899C55
Because the I/O line with ISO7816 is only one, if I would like to use the integrated UART of my 8052 what I have to do?
I thought to tie the two pins (RXD and TXD) to the I/O contact on smartcard
in my code, when transmitting a byte, I disable receiving, then reanable, that is

clr ren
clr ti
mov sbuf,a
jnb ti,$
setb ren

when receiving I instead only check for receive complete:

jnb ri,$
mov a,sbuf
clr ri

would that work? or I have to do it in a different way?

regards, teo.