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SN8F2250B 参数 Datasheet PDF下载

SN8F2250B图片预览
型号: SN8F2250B
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-Bit Micro-Controller]
分类和应用: 微控制器
文件页数/大小: 133 页 / 1554 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
 浏览型号SN8F2250B的Datasheet PDF文件第33页浏览型号SN8F2250B的Datasheet PDF文件第34页浏览型号SN8F2250B的Datasheet PDF文件第35页浏览型号SN8F2250B的Datasheet PDF文件第36页浏览型号SN8F2250B的Datasheet PDF文件第38页浏览型号SN8F2250B的Datasheet PDF文件第39页浏览型号SN8F2250B的Datasheet PDF文件第40页浏览型号SN8F2250B的Datasheet PDF文件第41页  
SN8F2250B Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
2.3.3 STACK OPERATION EXAMPLE  
The two kinds of Stack-Save operations refer to the stack pointer (STKP) and write the content of program counter (PC)  
to the stack buffer are CALL instruction and interrupt service. Under each condition, the STKP decreases and points to  
the next available stack location. The stack buffer stores the program counter about the op-code address. The  
Stack-Save operation is as the following table.  
STKP Register  
Stack Buffer  
High Byte Low Byte  
Stack Level  
Description  
STKPB2  
STKPB1  
STKPB0  
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
Free  
STK0H  
STK1H  
STK2H  
STK3H  
STK4H  
STK5H  
STK6H  
STK7H  
-
Free  
STK0L  
STK1L  
STK2L  
STK3L  
STK4L  
STK5L  
STK6L  
STK7L  
-
0
1
2
3
4
5
6
7
8
-
-
-
-
-
-
-
-
-
> 8  
Stack Over, error  
There are Stack-Restore operations correspond to each push operation to restore the program counter (PC). The RETI  
instruction uses for interrupt service routine. The RET instruction is for CALL instruction. When a pop operation occurs,  
the STKP is incremented and points to the next free stack location. The stack buffer restores the last program counter  
(PC) to the program counter registers. The Stack-Restore operation is as the following table.  
STKP Register  
Stack Buffer  
High Byte Low Byte  
Stack Level  
Description  
STKPB2  
STKPB1  
STKPB0  
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
STK7H  
STK6H  
STK5H  
STK4H  
STK3H  
STK2H  
STK1H  
STK0H  
Free  
STK7L  
STK6L  
STK5L  
STK4L  
STK3L  
STK2L  
STK1L  
STK0L  
Free  
8
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
SONiX TECHNOLOGY CO., LTD  
Page 37  
Version 1.1  
 
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