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MC68HC000FN16 参数 Datasheet PDF下载

MC68HC000FN16图片预览
型号: MC68HC000FN16
PDF下载: 下载PDF文件 查看货源
内容描述: 增编M68000用户手册 [Addendum to M68000 User Manual]
分类和应用:
文件页数/大小: 26 页 / 243 K
品牌: MOTOROLA [ MOTOROLA ]
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8-bit mode requires two bus cycles to fetch the immediate data of the STOP instruction. After the  
processor clock is disabled, it is often necessary to disable the clock to other sections of your circuit.  
This can be done, but be careful that runt clocks and spurious glitches are not presented to the  
MC68SEC000. A timing diagram is shown in Figure 4.  
CLK  
S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7  
CPU_CLK  
AS  
RW  
DTACK  
Write to  
Low-Power  
Address  
Fetch Immediate  
Data of STOP  
Instruction  
Stop  
Figure 4. MC68SEC000 Clock Stop Timing for 16-Bit Data Bus  
Note: While the MC68SEC000 is in the low-power mode, all inputs must be driven to V or V , or have a  
DD  
SS  
pull-up or pull-down resistor.  
3. This step is optional depending on whether your applications require the MC68SEC000 signals with  
three-state capability to be placed into a high-impedance state. To place the MC68SEC000 into a  
three-state condition, the proper method for arbitrating the bus (as described in 5.2 Bus Arbitration  
in the M68000 User’s Manual, Rev 8) should be completed during the fetch of the status register data  
for the STOP instruction. A timing diagram with the bus arbitration sequence is shown in Figure 5.  
CLK  
S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7  
CPU_CLK  
AS  
RW  
DTACK  
BR  
BG  
Write to  
Low-Power  
Fetch Immediate  
Data of STOP  
Stop  
Figure 5. MC68SEC000 ClAo
d
c
d
r
k
es
s
Stop Timing with IBnsutrusctiAonrbitration for 16-Bit Data Bus  
6
M68000 USER’S MANUAL ADDENDUM  
MOTOROLA