参数资料
型号: MC68HC05V7FN
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 22/170页
文件大小: 589K
代理商: MC68HC05V7FN
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 104
MC68HC05V7 Specification Rev. 1.0
The MDLC has three 11 byte buffer arrays. The transmit circuitry uses a single Tx Buffer,
that for certain periods of time may have either the CPU or the MDLC access "locked out".
The receiver has two Rx Buffers but only one can appear in the MCU memory map at a
time. The CPU will have access to whichever Rx Buffer was filled the earliest. While the
CPU is reading data from one Rx Buffer, the MDLC may place incoming data into the other
Rx Buffer. When the CPU writes to the MRSR register, the Rx Buffer which the CPU had
access to is "given back" to the MDLC making it available for another incoming message.
The MDLC Tx Buffer is writable by the CPU at all times but it is not readable. A read of the
Tx buffer will result in an unknown value. The Rx Buffers can be read by the CPU at
anytime. However, writes to the Rx Buffer will not have an effect on the buffer’s content.
NOTE:
The contents of the Tx Buffer are not guaranteed to remain intact following
a transmission so the Tx Buffer should be completely reloaded for each
new message to be sent.
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