參數(shù)資料
型號(hào)： EM78459
英文描述： Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC
中文描述： 8位微控制器的通用產(chǎn)品
文件頁(yè)數(shù)： 46/57頁(yè)
文件大小： 854K
代理商： EM78459
EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
50
Bit 2 (HLF): Frequency mode.
0: Low frequency(<32.768KHz)
1: High frequency(
≥32.768KHz)
Bit 3 (MS): Oscillator types.
0: RC type
1: Crystal type
Bit 4 (CK2): Clocks per instruction.
0: 2 clocks
1: 4 clocks
Bit 5 (ENWDTB): WatchDog Timer (WDT) control.
0: Enable WDT
1: Always disable WDT
4.15 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.
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 registers can be regarded as general registers. That is, the same instruction can operate
on I/O registers.
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. The symbol
"b" represents a bit field designator that selects the value for the bit located in the register "R" that is
affected by the operation. The symbol "k" represents an 8 or 10-bit constant or literal value.
Table 16 The list of the instruction set of EM78458/459
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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