XC2700 Datasheet, PDF (42/62 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller

XC2700 Derivatives
XC2000 Family / Alpha Line
Detailed Errata Description
USIC_AI.016 Transmit parameters are updated during FIFO buffer bypass
Transmit Control Information (TCI) can be transferred from the bypass structure to the
USIC channel when a bypass data is loaded into TBUF. Depending on the setting of
TCSR register bit fields, different transmit parameters are updated by TCI:
• When SELMD = 1, PCR.CTR[20:16] is updated by BYPCR.SELO (applicable only in
SSC mode)
• When WLEMD = 1, SCTR.WLE and TCSR.EOF are updated by BYPCR.BWLE
• When FLEMD = 1, SCTR.FLE[4:0] is updated by BYPCR.BWLE
• When HPCMD = 1, SCTR.HPCDIR and SCTR.DSM are updated by BHPC
• When all of the xxMD bits are 0, no transmit parameters will be updated
However in the current device, independent of the xxMD bits setting, the following are
always updated by the TCI generated by the bypass structure, when TBUF is loaded with
a bypass data:
• WLE, HPCDIR and DSM bits in SCTR register
• EOF and SOF bits in TCSR register
• PCR.CTR[20:16] (applicable only in SSC mode)
Workaround
The application must take into consideration the above behaviour when using FIFO
buffer bypass.
USIC_AI.018 Clearing PSR.MSLS bit immediately deasserts the SELOx
output signal
In SSC master mode, the transmission of a data frame can be stopped explicitly by
clearing bit PSR.MSLS, which is achieved by writing a 1 to the related bit position in
register PSCR.
This write action immediately clears bit PSR.MSLS and will deassert the slave select
output signal SELOx after finishing a currently running word transfer and respecting the
slave select trailing delay (T_td) and next-frame delay (T_nf).
However in the current implementation, the running word transfer will also be
immediately stopped and the SELOx deasserted following the slave select delays.
If the write to register PSCR occurs during the duration of the slave select leading delay
(T_ld) before the start of a new word transmission, no data will be transmitted and the
SELOx gets deasserted following T_td and T_nf.
Workaround
There are two possible workarounds:
Errata Sheet
42
V1.7, 2014-10