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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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8.7  
Application Notes  
Application programmers should note that the following types of contention can occur in the free-  
running timer.  
Contention between FRC Write and Clear: If an internal counter clear signal is generated  
during the T3 state of a write cycle to the lower byte of the free-running counter, the clear signal  
takes priority and the write is not performed.  
Figure 8.16 shows this type of contention.  
Write cycle:  
CPU write to lower byte of FRC  
T1  
T2  
T3  
ø
Internal address  
bus  
FRC address  
Internal write  
signal  
FRC clear signal  
FRC  
N
H'0000  
Figure 8.16 FRC Write-Clear Contention  
183  
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