参数资料
型号: MC68HC05V7FNR2
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: 31/170页
文件大小: 589K
代理商: MC68HC05V7FNR2
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 112
MC68HC05V7 Specification Rev. 1.0
15.5
MDLC MUX INTERFACE
The MUX Interface is responsible for bit encoding/decoding and digital noise filtering
between the Protocol Handler and the Physical Interface.
15.5.1
Rx DIGITAL FILTER
The Receiver section of the MDLC includes a digital low pass filter to remove narrow noise
pulses from the incoming message. An outline of the digital filter is shown below.
Physical Interface
To CPU
Protocol Handler
MUX Interface
CPU Interface
Rx/Tx
Buffers
To J1850 Bus
MDLC
Figure 15-9:
MDLC Rx Digital Filter Block
4-Bit Up/Down Counter
Data
Latch
up/down
= 15
s
q
Filtered
Rx Data Out
MUX Interface Clock
Input
Sync
dq
Rx Data
from
Physical
Interface
(RxP)
= 0
r
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