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SCI Control Registers

Table 29-10. SCI Flags Register (SCIFLR) Field Descriptions (continued)

Bit Field Value Description

1 WAKEUP Wakeup flag. This bit is set by the SCI when receiver or transmitter activity has taken the module

out of power-down mode. An interrupt is generated if the SET WAKEUP INT bit (SCISETINT[2]) is

set. It is cleared by the following:

• Setting of the SW nRST bit

• Setting of the RESET bit

• A system reset

• Writing a 1 to this bit

• Reading the corresponding interrupt offset in SCIINTVECT0/1

For compatibility mode, see the SCI document for more information on lowpower mode.

0 Read: The module will not wake up from power-down mode.

Write: No effect.

1 Read: Wake up from power-down mode.

Write: The bit is cleared to 0.

0 BRKDT SCI break-detect flag. This bit is set when the SCI detects a break condition on the LINRX pin. A

break condition occurs when the SCIRX pin remains continuously low for at least 10 bits after a

missing first stop bit, that is, after a framing error. Detection of a break condition causes the SCI to

generate an error interrupt if the BRKDT INT ENA bit is set. The BRKDT bit is reset by the

following:

• Setting of the SW nRST bit

• Setting of the RESET bit

• A system reset

• Writing a 1 to this bit

• Reading the corresponding interrupt offset in SCIINTVECT0/1

0 Read: No break condition has been detected since the last clear.

Write: No effect.

1 Read: A break condition has been detected.

Write: The bit is cleared to 0.

Table 29-11. SCI Receiver Status Flags

SCI Flag Register Bit Value After SW nRESET

(1)

FE SCIFLR 26 0

OE SCIFLR 25 0

PE SCIFLR 24 0

RXWAKE SCIFLR 12 0

RXRDY SCIFLR 9 0

BRKDT SCIFLR 0 0

(1)

The flags are frozen with their reset value while SW nRESET = 0.

Table 29-12. SCI Transmitter Status Flags

SCI Flag Register Bit Value After SW nRESET

(1)

TX EMPTY SCIFLR 11 1

TXRDY SCIFLR 8 1

(1)

The flags are frozen with their reset value while SW nRESET = 0.

1469

SPNU562–May 2014 Serial Communication Interface (SCI) Module

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