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HD6473434F16 参数 Datasheet PDF下载

HD6473434F16图片预览
型号: HD6473434F16
PDF下载: 下载PDF文件 查看货源
内容描述: 12伏不能应用于S -掩模模型(单电源规格) ,因为这可能会永久损坏设备。 [12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.]
分类和应用: 外围集成电路微控制器可编程只读存储器时钟
文件页数/大小: 752 页 / 2557 K
品牌: HITACHI [ HITACHI SEMICONDUCTOR ]
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Pin Auto-Wait Mode: If the WAIT pin is low, the number of wait states (TW) selected by bits  
WC1 and WC0 are inserted.  
In pin auto-wait mode, if the WAIT pin is low at the fall of the system clock (ø) in the T2 state, the  
number of wait states (TW) selected by bits WC1 and WC0 are inserted. No additional wait states  
are inserted even if the WAIT pin remains low. Pin auto-wait mode can be used for an easy  
interface to low-speed memory, simply by routing the chip select signal to the WAIT pin.  
Figure 5.4 shows the timing when the wait count is 1.  
T1  
T2  
T3  
T1  
T2  
TW  
T3  
ø
*
*
WAIT  
Address bus  
AS  
External address  
External address  
RD  
Read  
access  
Read data  
Read data  
Data bus  
WR  
Write  
access  
Data bus  
Write data  
Write data  
Note: * Arrows indicate time of sampling of the WAIT pin.  
Figure 5.4 Pin Auto-Wait Mode  
88  
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