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型號(hào)：	MC68EN360FE25
廠商：	FREESCALE SEMICONDUCTOR INC
元件分類：	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)：	641/962頁(yè)
文件大小：	26435K
代理商：	MC68EN360FE25

Parallel Interface Port (PIP)

MC68360 USER’S MANUAL

FC3-0 —Function Code 3-0

These bits contain the function code value used during this SDMA channel’s memory ac-

cesses. It is suggested that the user write bit FC3 with a one to identify this SDMA channel

access as a DMA-type access. Example: FC3-FC0 = 1000 (binary). Do not write the value

0111 (binary) to these bits.

MOT—Motorola

This bit should be set by the user to achieve normal operation.

0 = DEC (and Intel) convention is used for byte ordering. Swapped operation. Also

called little-endian byte ordering. The bytes stored in each buffer word are reversed

as compared to the Motorola mode.

1 = Motorola byte ordering. Normal operation. Also called big-endian byte ordering. As

data is received from the serial line and put into the buffer, the most significant byte

of the buffer word contains data received earlier than the least significant byte of

the same buffer word.

Res—Reserved. Should be set to zero by the user.

7.13.8.16 RECEIVER BUFFER DESCRIPTOR POINTER (RBPTR). The receiver buffer

descriptor pointer (RBPTR) points to the next BD that the receiver will transfer data to when

it is in IDLE state, or to the current BD during frame reception. After a reset or when the end

of BD table is reached, the CP initializes this pointer to the value programmed in the RBASE

entry. Although RBPTR need never be written by the user in most applications, it may be

modified by the user when the receiver is disabled.

7.13.8.17 CENTRONICS RECEIVER PROGRAMMING MODEL. The host configures the

PIP to operate as a Centronics controller by programming the PIP Configuration register

(PIPC). Timing attributes (ACK pulse width and the timing between ACK and BUSY) are set

by programming the PIP Timing Parameters register (PTPR). The receive errors are

reported through the Rx BD.

7.13.8.18 CENTRONICS CONTROL CHARACTERS. The Centronics receiver has the

capability to recognize special control characters. These characters may be used when the

Centronics functions in a message oriented environment. Up to eight control characters may

be defined by the user in the Control Characters Table. Each of these characters may be

either written to the receive buffer (upon which the buffer is closed and a new receive buffer

taken) or rejected. If rejected, the character is written to the Received Control Character

useful for notifying the user of the arrival of control characters that are not part of the

received messages.

The Centronics receiver uses a table of 16-bit entries to support control character recogni-

tion. Each entry consists of the control character, a valid bit, and a reject character bit.

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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