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型號(hào)：	MC68EN360FE25
廠商：	FREESCALE SEMICONDUCTOR INC
元件分類(lèi)：	微控制器/微處理器
英文描述：	RISC MICROCONTROLLER, CQFP240
封裝：	CERAMIC, QFP-240
文件頁(yè)數(shù)：	582/962頁(yè)
文件大?。?/td>	26435K
代理商：	MC68EN360FE25

Serial Management Controllers (SMCs)

MC68360 USER’S MANUAL

7.11.10.9 SMC TRANSPARENT ERROR-HANDLING PROCEDURE. The SMC reports

message reception and transmission error conditions using the channel BDs and the SMC

event register.

7.11.10.9.1 Transmission Error (Underrun). When this error occurs, the channel termi-

nates buffer transmission, closes the buffer, sets the UN bit in the BD, and generates the

TXE interrupt if it is enabled. The channel resumes transmission after the reception of the

RESTART TRANSMIT command. Underrun cannot occur between frames.

7.11.10.9.2 Reception Error (Overrun). The SMC maintains an internal FIFO for receiving

data (shift register plus data register). The CP begins programming the SDMA channel (if

the data buffer is in external memory) when the first character is received into the FIFO. If a

FIFO overrun occurs, the SMC writes the received data character to the internal FIFO over

the previously received character. The previous character and its status bits are lost. Fol-

lowing this, the channel closes the buffer, sets the OV bit in the BD, and generates the RX

interrupt if it is enabled. Reception then continues normally.

7.11.10.10 SMC TRANSPARENT MODE REGISTER (SMCMR). The operating mode of

an SMC is defined by the SMCMR. The SMCMR is a 16-bit, memory-mapped, read-write

protocol. The function of bits 15–8 varies according to the protocol selected by the SM bits.

Bits 15, 10, 9, 7, 6—Reserved

CLEN—Character Length

CLEN is programmed with a value from 3 to 15 to obtain 4 to 16 bits per character. If the

character length is less than 8 bits, the MSBs of the byte in buffer memory are not used

on transmit and are written with zeros on receive. If the character length is more than 8

bits, but less than 16 bits, the MSBs of the word in buffer memory will not be used on trans-

mit and will be written with zeros on receive.

The values 0 to 2 should not be written to CLEN, or erratic be-

havior may result.

Larger character lengths increase the potential performance of

the SMC channel and lower the performance impact on other

channels. For instance, the use of 16-bit characters, rather than

8-bit characters, is encouraged if 16-bit characters are accept-

able in the end application.

REVD—Reverse Data

0 = Normal mode

1 = Reverse the character bit order; the MSB is transmitted first.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MC68EN360FE25C	制造商:Motorola Inc 功能描述:
MC68EN360FE25V	制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:QUad Integrated Communications Controller Users Manual
MC68EN360FE33	制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:QUad Integrated Communications Controller Users Manual
MC68EN360FS25C	制造商:Motorola 功能描述:68EN360 S2C4B
MC68EN360RC25	制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:QUad Integrated Communications Controller Users Manual

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