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型號：	S80C51C-20D
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQCC44
封裝：	PLASTIC, LCC-44
文件頁數(shù)：	560/1021頁
文件大?。?/td>	15196K
代理商：	S80C51C-20D

32072H–AVR32–10/2012

AT32UC3A3

In SPI slave mode, a low level on NSS for at least one bit period will allow the slave to initiate a

transmission or reception. The Underrun Error bit (CSR.UNRE) is set if a character must be sent

while THR is empty, and TXD will be high during character transmission, as if 0xFF was being

sent. An interrupt request is generated if the Underrun Error bit in the Interrupt Mask Register

(IMR.UNRE) is set. If a new character is written to THR it will be sent correctly during the next

transmission slot. Writing a one to CR.RSTSTA will clear CSR.UNRE. To ensure correct behav-

ior of the receiver in SPI slave mode, the master device sending the frame must ensure a

minimum delay of one bit period in between each character transmission.

Receiver Time-out

Receiver Time-outs are not possible in SPI mode as the Baud Rate Clock is only active during

data transfers.

Manchester Encoder/Decoder

Writing a one to the Manchester Encoder/Decoder bit in the Mode Register (MR.MAN) enables

the Manchester Encoder/Decoder. When the Manchester Encoder/Decoder is used, characters

transmitted through the USART are encoded in Manchester II Biphase format. Depending on

polarity configuration, selected by the Transmission Manchester Polarity bit in the Manchester

Configuration Register (MAN.TX_MOPL),a logic level (zero or one) is transmitted as the transi-

tion from high -to-low or low-to-high during the middle of each bit period. This consumes twice

the bandwidth of the simpler NRZ coding schemes, but the receiver has more error control since

the expected input has a transition at every mid-bit period.

Manchester Encoder

An example of a Manchester encoded sequence is the byte 0xB1 (10110001) being encoded to

10 01 10 10 01 01 01 10, assuming default encoder polarity. Figure 25-44 illustrates this coding

Figure 25-44. NRZ to Manchester Encoding

A Manchester encoded character can be preceded by both a preamble sequence and a start

frame delimiter. The preamble sequence is a pre-defined pattern with a configurable length from

1 to 15 bit periods. If the preamble length is zero, the preamble waveform is not generated. The

preamble length is selected by writing to the Transmitter Preamble Length field (MAN.TX_PL).

The available preamble sequence patterns are:

and are selected by writing to the Transmitter Preamble Pattern field (MAN.TX_PP). Figure 25-

45 illustrates the supported patterns.

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相關代理商/技術參數(shù)	參數(shù)描述
S80C51C-25	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-30	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-36	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51C-L16	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
S80C51FA-1	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller

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