ST72325AR7-Auto datasheet(152/243 Pages) STMICROELECTRONICS

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Serial communications interface (SCI)

ST72325xxx-Auto

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Doc ID 13770 Rev 3

4IDLE

Idle line detect

This bit is set by hardware when an Idle Line is detected. An interrupt is generated if

the ILIE = 1 in the SCICR2 register. It is cleared by a software sequence (an access

to the SCISR register followed by a read to the SCIDR register).

0: No Idle Line is detected

1: Idle Line is detected

Note: The IDLE bit is not set again until the RDRF bit has been set itself (that is, a

new idle line occurs).

3OR

Overrun error

This bit is set by hardware when the word currently being received in the shift

is generated if RIE = 1 in the SCICR2 register. It is cleared by a software sequence

(an access to the SCISR register followed by a read to the SCIDR register).

0: No Overrun error

1: Overrun error is detected

Note: When this bit is set RDR register content is not lost but the shift register is

overwritten.

2NF

Noise flag

This bit is set by hardware when noise is detected on a received frame. It is cleared

by a software sequence (an access to the SCISR register followed by a read to the

SCIDR register).

0: No noise is detected

1: Noise is detected

Note: This bit does not generate interrupt as it appears at the same time as the

RDRF bit which itself generates an interrupt.

1FE

Framing error

This bit is set by hardware when a de-synchronization, excessive noise or a break

character is detected. It is cleared by a software sequence (an access to the SCISR

0: No Framing error is detected

1: Framing error or break character is detected

Note: This bit does not generate interrupt as it appears at the same time as the

RDRF bit which itself generates an interrupt. If the word currently being transferred

causes both frame error and overrun error, it will be transferred and only the OR bit

will be set.

0PE

Parity error

This bit is set by hardware when a parity error occurs in receiver mode. It is cleared

by a software sequence (a read to the status register followed by an access to the

SCIDR data register). An interrupt is generated if PIE = 1 in the SCICR1 register.

0: No parity error

1: Parity error

Table 74.

SCISR register description (continued)

Bit

Name

Function

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