C167CS datasheet(269/517 Pages) INFINEON

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C167CS

Derivatives

The Asynchronous/Synchronous Serial Interface

User’s Manual

11-3

V2.0, 2000-07

A transmission is started by writing to the Transmit Buffer register S0TBUF (via an

instruction or a PEC data transfer). Only the number of data bits which is determined by

the selected operating mode will actually be transmitted, i.e. bits written to positions 9

through 15 of register S0TBUF are always insignificant. After a transmission has been

completed, the transmit buffer register is cleared to 0000H.

Data transmission is double-buffered, so a new character may be written to the transmit

buffer register, before the transmission of the previous character is complete. This allows

the transmission of characters back-to-back without gaps.

Data reception is enabled by the Receiver Enable Bit S0REN. After reception of a

character has been completed, the received data and, if provided by the selected

operating mode, the received parity bit can be read from the (read-only) Receive Buffer

operating mode will be read as zeros.

Data reception is double-buffered, so that reception of a second character may already

begin before the previously received character has been read out of the receive buffer

S0PE

Parity Error Flag

Set by hardware on a parity error (S0PEN = ‘1’). Must be reset by

software.

S0FE

Framing Error Flag

Set by hardware on a framing error (S0FEN = ‘1’). Must be reset by

software.

S0OE

Overrun Error Flag

Set by hardware on an overrun error (S0OEN = ‘1’). Must be reset by

software.

S0ODD

Parity Selection Bit

Even parity (parity bit set on odd number of ‘1’s in data)

Odd parity (parity bit set on even number of ‘1’s in data)

S0BRS

Baudrate Selection Bit

Divide clock by reload-value + constant (depending on mode)

Additionally reduce serial clock to 2/3rd

S0LB

Loopback Mode Enable Bit

Standard transmit/receive mode

Loopback mode enabled

S0R

Baudrate Generator Run Bit

Baudrate generator disabled (ASC0 inactive)

Baudrate generator enabled

Bit

Function

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