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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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4.4  
Note on Stack Handling  
In word access, the least significant bit of the address is always assumed to be 0. The stack is  
always accessed by word access. Care should be taken to keep an even value in the stack pointer  
(general register R7). Use the PUSH and POP (or MOV.W Rn, @–SP and MOV.W @SP+, Rn)  
instructions to push and pop registers on the stack.  
Setting the stack pointer to an odd value can cause programs to crash. Figure 4.9 shows an  
example of damage caused when the stack pointer contains an odd address.  
H'FECC  
H'FECD  
PCH  
PCL  
R1L  
PCL  
SP  
SP  
H'FECF  
SP  
BSR instruction  
MOV.B R1L, @–R7  
PC is improperly stored  
beyond top of stack  
PCH is lost  
H'FECF set in SP  
PCH: Upper byte of program counter  
PCL: Lower byte of program counter  
R1L: General register  
SP: Stack pointer  
Figure 4.9 Example of Damage Caused by Setting an Odd Address in R7  
82  
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