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EM78156EAS 参数 Datasheet PDF下载

EM78156EAS图片预览
型号: EM78156EAS
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器与MASK ROM [8-Bit Microcontroller with MASK ROM]
分类和应用: 微控制器光电二极管局域网有原始数据的样本ROM
文件页数/大小: 48 页 / 420 K
品牌: ELAN [ ELAN MICROELECTRONICS CORP ]
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EM78156E  
8-Bit Microcontroller with MASK ROM  
Vdd  
Vdd  
R1  
EM78156E  
Q1  
/RESET  
R2  
40K  
Fig. 16 Circuit 2 for the Residue Voltage Protection  
4.12 Instruction Set  
Each instruction in the instruction set is a 13-bit word divided into an OP code and one  
or more operands. Normally, all instructions are executed within one single instruction  
cycle (one instruction consists of 2 oscillator periods), unless the program counter is  
changed by instruction "MOV R2,A", "ADD R2,A", or by instructions of arithmetic or  
logic operation on R2 (e.g. "SUB R2,A", "BS(C) R2,6", "CLR R2", ⋅⋅⋅⋅). In this case, the  
execution takes two instruction cycles.  
If for some reasons, the specification of the instruction cycle is not suitable for certain  
applications, try modifying the instruction as follows:  
(A) Change one instruction cycle to consist of 4 oscillator periods.  
(B) "JMP", "CALL", "RET", "RETL", "RETI", or the conditional skip ("JBS", "JBC", "JZ",  
"JZA", "DJZ", "DJZA") commands which were tested to be true, are executed within  
two instruction cycles. The instructions that are written to the program counter also  
take two instruction cycles.  
Case (A) is selected by the CODE Option bit, called CLK. One instruction cycle  
consists of two oscillator clocks if CLK is low, and four oscillator clocks if CLK is high.  
Note that once the 4 oscillator periods within one instruction cycle is selected as in  
Case (A), the internal clock source to TCC should be CLK=Fosc/4, not Fosc/ 2 as  
shown in Fig. 5.  
In addition, the instruction set has the following features:  
(1) Every bit of any register can be set, cleared, or tested directly.  
(2) The I/O register can be regarded as general register. That is, the same instruction  
can operate on I/O register.  
Product Specification (V1.3) 07.29.2004  
27  
(This specification is subject to change without further notice)  
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