參數(shù)資料
型號: MC68HC705V8CFU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 23/172頁
文件大?。?/td> 890K
代理商: MC68HC705V8CFU
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 108
MC68HC705V8 Specification Rev. 2.1
The Rx Buffer will then be released back to the MDLC. If another message is available in
the second Rx Buffer at this time, the new message will then be made available to the CPU.
Following a write to the MRSR to release the Rx Buffer, this register should not be
accessed again until the RXMS bit is again verified to be set. This procedure will ensure
that the MRSR value does not change while it is being accessed by the CPU.
If, while performing the above operations, another message begins to arrive then the
second message will be placed in a duplicate Rx Buffer. The MDLC will always present the
oldest available message to the programmer, therefore only one Rx Buffer appears in the
memory map while the other one is filled with a newer message.
If both Rx Buffers are filled when a third new message arrives, the third message will be
ignored and the prior messages within the Rx Buffers will not be affected.
15.3
MDLC Rx/Tx BUFFERS
The Rx and Tx Buffers provide the interface between the CPU Interface and the Protocol
Handler. They provide buffering of data being sent and received, reducing the frequency of
interrupts to the CPU. Please refer to the MCU memory map for details on the starting and
ending addresses of these buffers within the overall memory map.
15.3.1
OUTLINE
During all modes of MCU operation, the Rx and Tx Buffers are mapped as registers.
Memory mapping these buffers requires the MDLC to supply the user with a count of the
number of bytes in each received message and allows the user to tell the MDLC the length
of a message to be transmitted.
Physical Interface
To CPU
Protocol Handler
MUX Interface
CPU Interface
Rx/Tx
Buffers
To J1850 Bus
MDLC
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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