ST20-GP6 datasheet(93/123 Pages) STMICROELECTRONICS

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ST20-GP6

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ASCStatus register

The

ASCStatus register determines the cause of an interrupt.

Timeout register

The timeout register determines the timeout period.

ASCStatus

ASC base address + #14

Read Only

Bit

Bit ﬁeld

Function

RxBufFull

Set when rxﬁfo not empty

TxEmpty

Set when transmit shift register is empty

TxHalfEmpty

Set when txﬁfo at least half empty

ParityError

Set when the rxﬁfo contains something received with a parity error

FrameError

Set when the rxﬁfo contains something received with a frame error

OverrunError

Set when data is received and the rxﬁfo is full.

TimeoutNotEmpty Set when there’s a timeout and the rxﬁfo is not empty

TimeoutIdle

Set when there’s a timeout and the rxﬁfo is empty

RxHalfFull

Set when the rxﬁfo contains at least 8 characters

TxFull

Set when the txﬁfo contains 16 characters

15:10

RESERVED. Read back 0.

Table 15.6

ASCStatus register format

ASCTimeOut

ASC base address + #1C

Read/Write

Bit

Bit ﬁeld

Function

7:0

TimeOut

Timeout period in baud rate ticks

15:8

RESERVED. Write 0, will read back 0.

Table 15.7

ASCTimeout register format

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