SDA6000 Datasheet, PDF (207/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Peripherals
Depending on the asynchronous operating mode (controlled by bitfield CON_M), the
ASC output signal or the RXD input signal in echo mode (controlled by bit
ABCON_ABEM) is switched to the TXD output by an inverter (controlled by bit
ABCON_TXINV).
RxD
MUX
Autobaud
Detection
ABCON
RXINV
ABEM
TXINV
IrDA
IrDA
MUX
Coding
Decoding
MUX
ASC
Asynch. Mode Logic
MUX
MUX
CON
RxDI
M
LB
MUX TxD
UED11148
Figure 7-29 RXD/TXD Data Path in Asynchronous Modes
In echo mode, the transmit output signal of the ASC_P3 logic is blocked by the echo
mode output multiplexer. Figure 7-29 also shows that it is not possible to use an IrDA
coded receiver input signal for autobaud detection.
7.3.2 Synchronous Operation
Synchronous mode supports half-duplex communication, basically for simple I/O
expansion via shift registers. Data is transmitted and received via pin RXD0 while pin
TXD0 outputs the shift clock. These signals are alternate functions of port pins.
Synchronous mode is selected with S0M = ‘000_B’.
8 data bits are transmitted or received synchronous to a shift clock, generated by the
internal baud rate generator. The shift clock is only active as long as data bits are
transmitted or received.
Users Manual
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2000-06-15