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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  
2.1.4.7 Y, Z REGISTERS  
The Y and Z registers are the 8-bit buffers. There are three major functions of these registers.  
z
z
z
can be used as general working registers  
can be used as RAM data pointers with @YZ register  
can be used as ROM data pointer with the MOVC instruction for look-up table  
084H  
Y
Read/Write  
After reset  
Bit 7  
YBIT7  
R/W  
-
Bit 6  
YBIT6  
R/W  
-
Bit 5  
YBIT5  
R/W  
-
Bit 4  
YBIT4  
R/W  
-
Bit 3  
YBIT3  
R/W  
-
Bit 2  
YBIT2  
R/W  
-
Bit 1  
YBIT1  
R/W  
-
Bit 0  
YBIT0  
R/W  
-
083H  
Z
Read/Write  
After reset  
Bit 7  
ZBIT7  
R/W  
-
Bit 6  
ZBIT6  
R/W  
-
Bit 5  
ZBIT5  
R/W  
-
Bit 4  
ZBIT4  
R/W  
-
Bit 3  
ZBIT3  
R/W  
-
Bit 2  
ZBIT2  
R/W  
-
Bit 1  
ZBIT1  
R/W  
-
Bit 0  
ZBIT0  
R/W  
-
Example: Uses Y, Z register as the data pointer to access data in the RAM address 025H of bank0.  
B0MOV  
B0MOV  
B0MOV  
Y, #00H  
Z, #25H  
A, @YZ  
; To set RAM bank 0 for Y register  
; To set location 25H for Z register  
; To read a data into ACC  
Example: Uses the Y, Z register as data pointer to clear the RAM data.  
B0MOV  
B0MOV  
Y, #0  
Z, #07FH  
; Y = 0, bank 0  
; Z = 7FH, the last address of the data memory area  
CLR_YZ_BUF:  
END_CLR:  
CLR  
@YZ  
; Clear @YZ to be zero  
DECMS  
JMP  
Z
; Z – 1, if Z= 0, finish the routine  
; Not zero  
CLR_YZ_BUF  
CLR  
@YZ  
; End of clear general purpose data memory area of bank 0  
SONiX TECHNOLOGY CO., LTD  
Page 32  
Version 1.1  
 
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