ST20-GP1 datasheet(81/116 Pages) STMICROELECTRONICS

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ST20-GP1

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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

immediately 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 D0

RD1

Receive buffer data D1

RD2

Receive buffer data D2

RD3

Receive buffer data D3

RD4

Receive buffer data D4

RD5

Receive buffer data D5

RD6

Receive buffer data D6

RD7/Parity

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

Mode bit in the ASCControl register).

Note: If the Mode ﬁeld selects a 7-bit frame then this bit is undeﬁned. Software should ignore

this bit when reading 7-bit frames.

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 13.4 ASCRxBuffer register format

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