EM73982 View Datasheet(PDF) - ELAN Microelectronics
Part Name
Description
MFG CO.
'EM73982' PDF : 41 Pages View PDF
EM73982
4-BIT MICROCONTROLLER
(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.
PROGRAM EXAMPLE:
Check following arithematic operation for CF, ZF, SF
LDIA #00h;
LDIA #03h;
ADDA #05h;
ADDA #0Dh;
ADDA #0Eh;
CF ZF
SF
-
1
1
-
0
1
-
0
1
-
0
0
-
0
0
ALU
The arithematic operation of 4 - bit data is performed in ALU unit. There are 2 flags can be affected by
the result of ALU operation, ZF and SF. The operation of ALU can be affected by CF only.
ALU STRUCTURE
ALU supported user arithematic operation function, including : addition, subtraction and rotaion.
DATA BUS
ALU
ZF CF SF
* This specification are subject to be changed without notice.
11.30.2001 4
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