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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  
2.1.1.4 JUMP TABLE DESCRIPTION  
The jump table operation is one of multi-address jumping function. Add low-byte program counter (PCL) and ACC  
value to get one new PCL. If PCL is overflow after PCL+ACC, PCH adds one automatically. The new program counter  
(PC) points to a series jump instructions as a listing table. It is easy to make a multi-jump program depends on the  
value of the accumulator (A).  
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Note: PCH only support PC up counting result and doesn’t support PC down counting. When PCL is  
carry after PCL+ACC, PCH adds one automatically. If PCL borrow after PCL–ACC, PCH keeps value and  
not change.  
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Example: Jump table.  
ORG  
0X0100  
; The jump table is from the head of the ROM boundary  
B0ADD  
JMP  
JMP  
JMP  
JMP  
PCL, A  
; PCL = PCL + ACC, PCH + 1 when PCL overflow occurs.  
; ACC = 0, jump to A0POINT  
; ACC = 1, jump to A1POINT  
; ACC = 2, jump to A2POINT  
; ACC = 3, jump to A3POINT  
A0POINT  
A1POINT  
A2POINT  
A3POINT  
SONIX provides a macro for safe jump table function. This macro will check the ROM boundary and move the jump  
table to the right position automatically. The side effect of this macro maybe wastes some ROM size.  
¾
Example: If “jump table” crosses over ROM boundary will cause errors.  
@JMP_A  
MACRO  
IF  
VAL  
(($+1) !& 0XFF00) !!= (($+(VAL)) !& 0XFF00)  
JMP  
($ | 0XFF)  
($ | 0XFF)  
ORG  
ENDIF  
ADD  
PCL, A  
ENDM  
’
Note: “VAL” is the number of the jump table listing number.  
SONiX TECHNOLOGY CO., LTD  
Page 19  
Version 1.1  
 
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