ST20-GP6 datasheet(90/123 Pages) STMICROELECTRONICS

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ST20-GP6

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ASCRxBuffer register

The received data and, if provided by the selected operating mode, the received parity bit can be

read from the receive buffer register.

ASCControl register

This register controls the operating mode of the ASC and contains control bits for mode and error

check selection, and status ﬂags for error identiﬁcation.

Note: Programming the mode control ﬁeld (Mode) to one of the reserved combinations may result

in unpredictable behavior.

Note: Serial data transmission or reception is only possible when the baud rate generator run bit

(

Run) is set to 1. When the Run bit is set to 0, TXD will be 1. Setting the Run bit to 0 will immedi-

ately freeze the state of the transmitter and receiver. This should only be done when the ASC is

idle.

ASCRxBuffer

ASC base address + #08

Read only

Bit

Bit ﬁeld

Function

RD0

Receive buffer data

RD1

Receive buffer data

RD2

Receive buffer data

RD3

Receive buffer data

RD4

Receive buffer data

RD5

Receive buffer data

RD6

Receive buffer data

RD7/Parity

Receive buffer data

D7, or parity bit - dependent on the operating mode (the setting of the

Mode bit in the ASCControl register).

RD8/Parity/

Wake/X

Receive buffer data

D8, or parity bit, or wake-up bit - dependent on the operating mode (the

setting of the

Mode ﬁeld in the ASCControl register).

Note: If the

Mode ﬁeld selects a 7- or 8-bit frame then this bit is undeﬁned. Software should

ignore this bit when reading 7- or 8-bit frames.

15:9

RESERVED. Will read back 0.

Table 15.3

ASCRxBuffer register format

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