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参数资料
| 型号： | EM73MA89B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R |
| 中文描述： | 4，液晶产品位微控制器 |
| 文件页数： | 6/64页 |
| 文件大小： | 331K |
| 代理商： | EM73MA89B |
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14
* This specification are subject to be changed without notice.
10.15.2002 (V1.3)
EM73MA89B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
PROGRAM EXAMPLE:
Check following arithematic operation for CF, ZF, SF
CF
ZF
SF
LDIA #00h;
-
1
LDIA #03h;
-
0
1
ADDA #05h;
-
0
1
ADDA #0Dh;
-
0
ADDA #0Eh;
-
0
ALU
The arithematic operation of 4-bit data is performed in ALU unit. There are 2 flags that can be affected by
the result of ALU operation, ZF and SF. The operation of ALU is affected by CF only.
ALU STRUCTURE
ALU supported user arithematic operation functions, including Addition, Subtraction and Rotaion.
ALU FUNCTION
(1) Addition:
ALU supports addition function with instructions ADDAM, ADCAM, ADDM #k, ADD #k,y .... .
The addition operation affects CF and ZF. Under addition operation, if the result is "0", ZF will be "1",
otherwise, ZF will be "0". When the addition operation has a carry-out, CF will be "1", otherwise, CF will
be "0".
EXAMPLE:
Operation
Carry
Zero
3+4=7
0
7+F=6
1
0
0+0=0
0
1
8+8=0
1
(2) Subtraction:
ALU supports subtraction function with instructions SUBM #k, SUBA #k, SBCAM, DECM... . The
subtraction operation affects CF and ZF. Under subtraction operation, if the result is negative, CF will
be "0", and a borrow out, otherwise, if the result is positive, CF will be "1". For ZF, if the result of subtraction
operation is "0", the ZF is "1", likewise, ZF is "1".
ZF CF SF
ALU
DATA BUS
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