参数资料
型号: M68LC302CPU20VCT
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP100
封装: 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-100
文件页数: 47/128页
文件大小: 641K
代理商: M68LC302CPU20VCT
MC68EN302 Module Bus Controller
2-8
MC68EN302 REFERENCE MANUAL
MOTOROLA
Figure 2-2. 8-bit External to 16-bit Internal Read
Note that an external access of 16-bits to an 8-bit port requires an external address
increment as well as data muxing. It is generally recommended that external accesses using
the 8-bit chip select extensions access only 8-bits at a time and access that data on the
upper 8-bits of the bus.
Figure 2-3. 16-bit Internal to 8-bit External Write
First
Bus
Cycle
D15-8
Latched
External
Terminated
Internally
ID15-8
ID7-0
Terminated
Internally
External
Terminated
Internally
Second
Bus
Cycle
Increment
Address
D15-8
ID15-8
ID7-0
D15-8
ID15-8
ID7-0
ID15-8
ID7-0
D15-8
EVEN
BYTE
ACCESS
EVEN
WORD
ACCESS
ODD
BYTE
ACCESS
EVEN
BYTE
ACCESS
EVEN
WORD
ACCESS
ODD
BYTE
ACCESS
First
Bus
Cycle
D15-8
Latched
External
Terminated
Internally
ID15-8
ID7-0
Terminated
Internally
External
Terminated
Internally
Second
Bus
Cycle
Increment
Address
D15-8
ID15-8
ID7-0
D15-8
ID15-8
ID7-0
ID15-8
ID7-0
D15-8
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