ST20-GP6 datasheet(87/123 Pages) STMICROELECTRONICS

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ST20-GP6

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Figure 15.4 ASC status and interrupt registers

15.4.1 Using the ASC interrupts when ﬁfos are disabled

When ﬁfos are disabled, the ASC provides three interrupt requests to control data exchange via the

serial channel:

•

TxHalfEmpty is activated when data is moved from ASCTxBuffer to the txshift register.

•

TxEmpty is activated before the stop bit is transmitted.

•

RxBufFull is activated when the received frame is moved to ASCRxBuffer.

For single transfers it is sufﬁcient to use the transmitter interrupt (

TxEmpty), which indicates that

the previously loaded data has been transmitted, except for the stop bit.

For multiple back-to-back transfers using

TxEmpty would leave just one stop bit time for the han-

dler to respond to the interrupt and initiate another transmission. Using the transmit buffer interrupt

(

TxHalfEmpty) to reload transmit data allows the time to transmit a complete frame for the service

routine, as

ASCTxBuffer may be reloaded while the previous data is still being transmitted.

ASCStatus

RxBufFull

TxEmpty

TxHalfEmpty

ParityError

FrameError

OverrunError

TimeoutNotEmpty

TimeoutIdle

RxHalfFull

TxFull

ASCIntEnable

RxBufFull IE

TxEmpty IE

TxHalfEmpty IE

ParityError IE

FrameError IE

OverrunError IE

TimeoutNotEmpty IE

TimeoutIdle IE

RxHalfFull IE

ASC_interrupt

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