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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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2.7.2  
Access to On-Chip Register Field and External Devices  
The on-chip supporting module registers and external devices are accessed in a cycle consisting of  
three states: T1, T2, and T3. Only one byte of data can be accessed per cycle, via an 8-bit data bus.  
Access to word data or instruction codes requires two consecutive cycles (six states).  
Figure 2.15 shows the access cycle for the on-chip register field. Figure 2.16 shows the associated  
pin states. Figures 2.17 (a) and (b) show the read and write access timing for external devices.  
Bus cycle  
T2 state  
Address  
T3 state  
T1 state  
ø
Internal address  
bus  
Internal read  
signal  
Internal data bus  
(read)  
Read data  
Internal write  
signal  
Internal data bus  
(write)  
Write data  
Figure 2.15 On-Chip Register Field Access Cycle  
53  
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