SAB82538 Datasheet, PDF (98/253 Pages) Infineon Technologies AG – ICs for Communications

SAB 82538
SAF 82538
Figure 43
RTS – CTS Handshaking
Beyond this standard RTS function, signifying a transmission request of a frame
(Request To Send), the RTS output may be programmed for a special function via
SOC1, SOC0 bits in the CCR2 register, provided the serial channel is operating in a bus
configuration in clock mode 0 or 1.
q If SOC1, SOC0 bits are set to “11”, the RTS output is active (= low) during the
reception of a frame.
q If SOC1, SOC0 bits are set to “10”, the RTS output function is disabled and the RTS
pin remains always high.
2.6.5.2 Carrier Detect (CD) Receiver Control
Similar to the RTS/CTS control for the transmitter, the ESCC8 supports the carrier detect
modem control function for the serial receivers, if the Carrier Detect Auto Start (CAS)
function is programmed by setting the CAS bit in the XBCH register. This function is
always available in clock modes 0, 2, 3, 4, 6, 7 via the CD pin. In clock mode 1 the CD
function is not supported. See table 5 for an overview.
If the CAS function is selected, the receiver is enabled and data reception is started
when the CD input is detected to be high. If CD input is set to “low”, reception of the
current character (byte) is still completed.
Semiconductor Group
98