参数资料
型号: MC68HC05V7CFNR2
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: 27/170页
文件大小: 589K
代理商: MC68HC05V7CFNR2
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 108
MC68HC05V7 Specification Rev. 1.0
15.4
MDLC PROTOCOL HANDLER
The Protocol Handler is responsible for framing, collision detection, arbitration, CRC
generation/checking, and error detection. The Protocol Handler conforms to SAE J1850 -
Class B Data Communications Network Interface.
15.4.1
OUTLINE
The Protocol Handler contains three main blocks: the State Machine, Rx Shift Register and
Tx Shift Register, as shown below. Each block will now be described in more detail.
15.4.2
Rx & Tx SHIFT REGISTERS
The Rx Shift Register gathers received serial data bits from the J1850 bus and makes them
available in parallel form to the Rx Buffer. The Tx Shift Register takes data, in parallel form,
from the Tx Buffer and presents it serially to the State Machine so that it can be transmitted
onto the J1850 bus.
Physical Interface
To CPU
Protocol Handler
MUX Interface
CPU Interface
Rx/Tx
Buffers
To J1850 Bus
MDLC
Rx Shift Register
Figure 15-8:
MDLC Protocol Handler Outline
To CPU Interface & Rx/Tx Buffers
State Machine
To MUX Interface
Rx
Data
Tx
Data
Control
8
Tx Shift Register
TxP
RxP
Control
8
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