MC9S08DN60F1CLF datasheet(239/356 Pages) FREESCALE

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Chapter 13 Serial Communications Interface (S08SCIV4)

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

239

13.2.5

SCI Status Register 2 (SCI1S2)

This register has one read-only status ﬂag.

Framing Error Flag — FE is set at the same time as RDRF when the receiver detects a logic 0 where the stop

bit was expected. This suggests the receiver was not properly aligned to a character frame. To clear FE, read

SCI1S1 with FE = 1 and then read the SCI data register (SCI1D).

0 No framing error detected. This does not guarantee the framing is correct.

1 Framing error.

Parity Error Flag — PF is set at the same time as RDRF when parity is enabled (PE = 1) and the parity bit in

the received character does not agree with the expected parity value. To clear PF, read SCI1S1 and then read

the SCI data register (SCI1D).

0 No parity error.

1 Parity error.

76543210

LBKDIF

RXEDGIF

RXINV

RWUID

BRK13

LBKDE

RAF

Reset

00000000

= Unimplemented or Reserved

Figure 13-9. SCI Status Register 2 (SCI1S2)

Table 13-6. SCI1S2 Field Descriptions

Field

Description

LBKDIF

LIN Break Detect Interrupt Flag — LBKDIF is set when the LIN break detect circuitry is enabled and a LIN break

character is detected. LBKDIF is cleared by writing a “1” to it.

0 No LIN break character has been detected.

1 LIN break character has been detected.

RXEDGIF

RxD Pin Active Edge Interrupt Flag — RXEDGIF is set when an active edge (falling if RXINV = 0, rising if

RXINV=1) on the RxD pin occurs. RXEDGIF is cleared by writing a “1” to it.

0 No active edge on the receive pin has occurred.

1 An active edge on the receive pin has occurred.

RXINV1

Receive Data Inversion — Setting this bit reverses the polarity of the received data input.

0 Receive data not inverted

1 Receive data inverted

RWUID

Receive Wake Up Idle Detect— RWUID controls whether the idle character that wakes up the receiver sets the

IDLE bit.

0 During receive standby state (RWU = 1), the IDLE bit does not get set upon detection of an idle character.

1 During receive standby state (RWU = 1), the IDLE bit gets set upon detection of an idle character.

BRK13

Break Character Generation Length — BRK13 is used to select a longer transmitted break character length.

Detection of a framing error is not affected by the state of this bit.

0 Break character is transmitted with length of 10 bit times (11 if M = 1)

1 Break character is transmitted with length of 13 bit times (14 if M = 1)

Table 13-5. SCI1S1 Field Descriptions (continued)

Field

Description

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