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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  
2.1.1.3 LOOK-UP TABLE DESCRIPTION  
In the ROM’s data lookup function, Y register is pointed to middle byte address (bit 8~bit 15) and Z register is pointed  
to low byte address (bit 0~bit 7) of ROM. After MOVC instruction executed, the low-byte data will be stored in ACC and  
high-byte data stored in R register.  
¾
Example: To look up the ROM data located “TABLE1”.  
B0MOV  
B0MOV  
MOVC  
Y, #TABLE1$M ; To set lookup table1’s middle address  
Z, #TABLE1$L  
; To set lookup table1’s low address.  
; To lookup data, R = 00H, ACC = 35H  
; Increment the index address for next address.  
INCMS  
JMP  
INCMS  
NOP  
Z
@F  
Y
; Z+1  
; Z is not overflow.  
; Z overflow (FFH Æ 00), Æ Y=Y+1  
;
;
@@:  
TABLE1:  
MOVC  
DW  
DW  
DW  
; To lookup data, R = 51H, ACC = 05H.  
;
; To define a word (16 bits) data.  
0035H  
5105H  
2012H  
’
Note: The Y register will not increase automatically when Z register crosses boundary from 0xFF to  
0x00. Therefore, user must take care such situation to avoid loop-up table errors. If Z register  
overflows, Y register must be added one. The following INC_YZ macro shows a simple method  
to process Y and Z registers automatically.  
¾
Example: INC_YZ macro.  
INC_YZ  
MACRO  
INCMS  
JMP  
Z
; Z+1  
@F  
; Not overflow  
INCMS  
NOP  
Y
; Y+1  
; Not overflow  
@@:  
ENDM  
SONiX TECHNOLOGY CO., LTD  
Page 17  
Version 1.1  
 
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