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參數(shù)資料
| 型號： | EM73469 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | Single Chip CMOS 4-Bit Micro-Controller for LCD Product(用于LCD顯示的工作電壓1.2V-1.8V的單片4位微控制器) |
| 中文描述： | 單芯片的CMOS 4位微控制器的LCD產(chǎn)品（用于液晶顯示的工作電壓1.2伏，1.8伏的單片4位微控制器） |
| 文件頁數(shù)： | 8/33頁 |
| 文件大?。?/td> | 187K |
| 代理商： | EM73469 |
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* This specification are subject to be changed without notice.
EM73469
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
7.17.1998
Preliminary
There are four kinds of flag, CF ( Carry flag ), ZF ( Zero flag ), SF ( Status flag ) and GF ( General flag ),
these 4 1-bit flags are affected by the arithematic, logic and comparative .... operation .
All flags will be put into stack when an interrupt subroutine is served, and the flags will be restored after
RTI instruction executed .
(1) Carry Flag ( CF )
The carry flag is affected by following operation:
a. Addition : CF as a carry out indicator, when the addition operation has a carry-out, CF will be "1",
in another word, if the operation has no carry-out, CF will be "0".
b. Subtraction : CF as a borrow-in indicator, when the subtraction operation must has a borrow, in the CF
will be "0", in another word, if no borrow-in, CF will be "1".
c. Comparision: CF is as a borrow-in indicator for Comparision operation as the same as subtraction
operation.
d. Rotation: CF shifts into the empty bit of accumulator for the rotation and holds the shift out data after
rotation.
e. CF test instruction : For TFCFC instruction, the content of CF sends into SF then clear itself "0".
For TTSFC instruction, the content of CF sends into SF then set itself "1".
(2) Zero Flag ( ZF )
ZF is affected by the result of ALU, if the ALU operation generate a "0" result, the ZF will be "1",
otherwise, the ZF will be "0".
(3) Status Flag ( SF )
The SF is affected by instruction operation and system status .
a. SF is initiated to "1" for reset condition .
b. Branch instruction is decided by SF, when SF=1, branch condition will be satisified, otherwise,
branch condition will not be satisified by SF = 0 .
(4) General Flag ( GF )
GF is a one bit general purpose register which can be set, clear, test by instruction SGF, CGF and TGS.
PROGRAM EXAMPLE:
Check following arithematic operation for CF, ZF, SF
Accumulator is a 4-bit data register for temporary data . For the arithematic, logic and comparative opertion
.., ACC plays a role which holds the source data and result .
FLAGS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM73469A | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:4-BIT MICRO-CONTROLLER FOR LCD PRODUCT |
| EM73866 | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:4-BIT MICRO-CONTROLLER FOR LCD PRODUCT |
| EM73880 | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:4-BIT MICRO-CONTROLLER FOR LCD PRODUCT |
| EM73962A | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:4-BIT MICROCONTROLLER |
| EM73963A | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:4-BIT MICRO-CONTROLLER FOR LCD PRODUCT |
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