STV3550B STMicroelectronics, STV3550B Datasheet - Page 126

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

TV chassis control
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The status bits cannot be reset by software because the ASC_n_Status register cannot be
written to directly. Status bits are reset by operations performed by the interrupt handler:
●
●
●
●
Using ASC interrupts when FIFOs are disabled (double-buffered operation)
The transmitter generates two interrupts; this provides advantages for the servicing
software. For normal operation (i.e. other than the error interrupt) when FIFOs are disabled
the ASC provides three interrupt requests to control data exchange via the serial channel:
●
●
●
Figure 77. ASC status and interrupt registers
Transmitter interrupt status bits (TxEmpty, TxHalfEmpty) are reset when a character is
written to the transmitter buffer
Receiver interrupt status bit (RxBufFull) is reset when a character is read from the
receive buffer
ParityError and FrameError status bits are reset when all characters containing errors
have been read from the receive input buffer
The OverrunError status bit is reset when a character is read from ASC_n_RxBuffer
TxHalfEmpty is activated when data is moved from ASC_n_TxBuffer to the transmit
shift register
TxEmpty is activated before the last bit of a frame is transmitted
RxBufFull is activated when the received frame is moved to ASC_n_RxBuffer
TimeoutnotEmpty
TxHalfEmpty
OverrunError
TimeoutIdle
FrameError
ParityError
RxHalfFull
RxBufFull
TxEmpty
Nacked
TxFull
TimeoutnotEmptyIE
OverrunErrorIE
TxHalfEmptyIE
TimeoutIdleIE
FrameErrorIE
ParityErrorIE
RxHalfFullIE
RxBufFullIE
TxEmptyIE
AND
AND
AND
AND
AND
AND
AND
AND
AND
OR
ASC interrupt
STV3550