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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 ]
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SN8F2250B Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
2.3.2 STACK REGISTERS  
The stack pointer (STKP) is a 3-bit register to store the address used to access the stack buffer, 14-bit data memory  
(STKnH and STKnL) set aside for temporary storage of stack addresses.  
The two stack operations are writing to the top of the stack (push) and reading from the top of stack (pop). Push  
operation decrements the STKP and the pop operation increments each time. That makes the STKP always point to  
the top address of stack buffer and write the last program counter value (PC) into the stack buffer.  
The program counter (PC) value is stored in the stack buffer before a CALL instruction executed or during interrupt  
service routine. Stack operation is a LIFO type (Last in and first out). The stack pointer (STKP) and stack buffer  
(STKnH and STKnL) are located in the system register area bank 0.  
0DFH  
STKP  
Read/Write  
After reset  
Bit 7  
GIE  
R/W  
0
Bit 6  
Bit 5  
Bit 4  
Bit 3  
Bit 2  
STKPB2  
R/W  
Bit 1  
STKPB1  
R/W  
Bit 0  
STKPB0  
R/W  
-
-
-
-
-
-
-
-
-
-
-
-
1
1
1
Bit[2:0]  
Bit 7  
STKPBn: Stack pointer (n = 0 ~ 2)  
GIE: Global interrupt control bit.  
0 = Disable.  
1 = Enable. Please refer to the interrupt chapter.  
¾
Example: Stack pointer (STKP) reset, we strongly recommended to clear the stack pointers in the  
beginning of the program.  
MOV  
B0MOV  
A, #00000111B  
STKP, A  
0F0H~0FFH  
STKnH  
Read/Write  
After reset  
Bit 7  
Bit 6  
Bit 5  
SnPC13  
R/W  
Bit 4  
SnPC12  
R/W  
Bit 3  
SnPC11  
R/W  
Bit 2  
SnPC10  
R/W  
Bit 1  
SnPC9  
R/W  
0
Bit 0  
SnPC8  
R/W  
0
-
-
-
-
-
-
0
0
0
0
0F0H~0FFH  
STKnL  
Read/Write  
After reset  
Bit 7  
Bit 6  
Bit 5  
Bit 4  
SnPC4  
R/W  
0
Bit 3  
SnPC3  
R/W  
0
Bit 2  
SnPC2  
R/W  
0
Bit 1  
SnPC1  
R/W  
0
Bit 0  
SnPC0  
R/W  
0
SnPC7  
R/W  
0
SnPC6  
R/W  
0
SnPC5  
R/W  
0
STKn = STKnH , STKnL (n = 7 ~ 0)  
SONiX TECHNOLOGY CO., LTD  
Page 36  
Version 1.1  
 
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