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型號：	MQ80C52CXXX-36SBR
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
文件頁數(shù)：	1012/1447頁
文件大小：	3788K
代理商：	MQ80C52CXXX-36SBR

6437E–ATARM–23-Apr-13

If a parity error is detected by the receiver, it drives the I/O line at 0 during the guard time, as

shown in Figure 33-32. This error bit is also named NACK, for Non Acknowledge. In this case,

the character lasts 1 bit time more, as the guard time length is the same and is added to the

error bit time which lasts 1 bit time.

When the USART is the receiver and it detects an error, it does not load the erroneous character

in the Receive Holding Register (US_RHR). It appropriately sets the PARE bit in the Status Reg-

ister (US_SR) so that the software can handle the error.

Figure 33-31. T = 0 Protocol without Parity Error

Figure 33-32. T = 0 Protocol with Parity Error

Receive Error Counter

The USART receiver also records the total number of errors. This can be read in the Number of

Error (US_NER) register. The NB_ERRORS field can record up to 255 errors. Reading US_NER

automatically clears the NB_ERRORS field.

Receive NACK Inhibit

The USART can also be configured to inhibit an error. This can be achieved by setting the

INACK bit in the Mode Register (US_MR). If INACK is at 1, no error signal is driven on the I/O

line even if a parity bit is detected, but the INACK bit is set in the Status Register (US_SR). The

INACK bit can be cleared by writing the Control Register (US_CR) with the RSTNACK bit at 1.

Moreover, if INACK is set, the erroneous received character is stored in the Receive Holding

Transmit Character Repetition

When the USART is transmitting a character and gets a NACK, it can automatically repeat the

character before moving on to the next one. Repetition is enabled by writing the

MAX_ITERATION field in the Mode Register (US_MR) at a value higher than 0. Each character

can be transmitted up to eight times; the first transmission plus seven repetitions.

If MAX_ITERATION does not equal zero, the USART repeats the character as many times as

the value loaded in MAX_ITERATION.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MQ82370-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
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MQ82380-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
MQ82592	制造商:Rochester Electronics LLC 功能描述:- Bulk

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