C167CS datasheet(299/517 Pages) INFINEON

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C167CS

Derivatives

The High-Speed Synchronous Serial Interface

User’s Manual

12-16

V2.0, 2000-07

A Transmit Error (Slave mode) is detected, when a transfer was initiated by the master

(shift clock gets active), but the transmit buffer SSCTB of the slave was not updated

since the last transfer. This condition sets the error flag SSCTE and, when enabled via

SSCTEN, the error interrupt request flag SSCEIR. If a transfer starts while the transmit

buffer is not updated, the slave will shift out the ‘old’ contents of the shift register, which

normally is the data received during the last transfer.

This may lead to the corruption of the data on the transmit/receive line in half-duplex

mode (open drain configuration), if this slave is not selected for transmission. This mode

requires that slaves not selected for transmission only shift out ones, i.e. their transmit

buffers must be loaded with ‘FFFFH’ prior to any transfer.

Note: A slave with push/pull output drivers, which is not selected for transmission, will

normally have its output drivers switched. However, in order to avoid possible

conflicts or misinterpretations, it is recommended to always load the slave’s

transmit buffer prior to any transfer.

Figure 12-6

SSC Error Interrupt Control

SSCTEN

SSCTE

Transmit

Error

SSCREN

SSCRE

Receive

Error

SSCPEN

SSCPE

Phase

Error

SSCBEN

SSCBE

Baudrate

Error

–

SSCEIE

SSCEIR

Error

Interrupt

SSCEINT

MCA01968

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