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EM78P447NAM Datasheet(PDF) 32 Page - ELAN Microelectronics Corp

Part No. EM78P447NAM
Description  8-BIT MICRO-CONTROLLER
Download  57 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 32 Page - ELAN Microelectronics Corp

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EM78P447N
OTP ROM
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) Executed within two instruction cycles, "JMP", "CALL", "RET", "RETL", "RETI", or the
conditional skip ("JBS", "JBC", "JZ", "JZA", "DJZ", "DJZA") instructions which were tested to be
true. Also execute within two instruction cycles, the instructions that are written to the program
counter.
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 indicated 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.
The symbol "R" represents a register designator that specifies which one of the registers (including
operational registers and general purpose registers) is to be utilized by the instruction. "b" represents a
bit field designator that selects the value for the bit which is located in the register "R", and affects
operation. "k" represents an 8 or 10-bit constant or literal value.
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
32
INSTRUCTION
BINARY
HEX
MNEMONIC
OPERATION
STATUS AFFECTED
0 0000 0000 0000
0000
NOP
No Operation
None
0 0000 0000 0001
0001
DAA
Decimal Adjust A
C
0 0000 0000 0010
0002
CONTW
A
→ CONT
None
0 0000 0000 0011
0003
SLEP
0
→ WDT, Stop oscillator
T,P
0 0000 0000 0100
0004
WDTC
0
→ WDT
T,P
0 0000 0000 rrrr
000r
IOW R
A
→ IOCR
None <Note1>


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