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參數(shù)資料
| 型號： | NSC800D |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| 中文描述： | NSC800TM高性能低功耗CMOS微處理器 |
| 文件頁數(shù)： | 25/76頁 |
| 文件大?。?/td> | 785K |
| 代理商： | NSC800D |
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NSC800 SOFTWARE
10.0 Introduction
This chapter provides the reader with a detailed description
of the NSC800 software. Each NSC800 instruction is de-
scribed in terms of opcode, function, flags affected, timing,
and addressing mode.
11.0 Addressing Modes
The following sections describe the addressing modes sup-
ported by the NSC800. Note that particular addressing
modes are often restricted to certain types of instructions.
Examples of instructions used in the particular addressing
modes follow each mode description.
The 10 addressing modes and 158 instructions provide a
flexible and powerful instruction set.
11.1 REGISTER
The most basic addressing mode is that which addresses
data in the various CPU registers. In these cases, bits in the
opcode select specific registers that are to be addressed by
the instruction.
Example:
Instruction: Load register B from register C
Mnemonic: LD
B,C
Opcode:
TL/C/5171–50
In this instruction, both the B and C registers are addressed
by opcode bits.
11.2 IMPLIED
The implied addressing mode is an extension to the register
addressing mode. In this mode, a specific register, the accu-
mulator, is used in the execution of the instruction. In partic-
ular, arithmetic operations employ implied addressing, since
the A register is assumed to be the destination register for
the result without being specifically referenced in the op-
code.
Example:
Instruction: Subtract the contents of register D from the
Accumulator (A register)
Mnemonic: SUB
D
Opcode:
TL/C/5171–51
In this instruction, the D register is addressed with register
addressing, while the use of the A register is implied by the
opcode.
11.3 IMMEDIATE
The most straightforward way of introducing data to the
CPU registers is via immediate addressing, where the data
is contained in an additional byte of multi-byte instructions.
Example:
Instruction: Load the E register with the constant value
X’7C.
Mnemonic: LD
E,X’7C
Opcode:
TL/C/5171–52
In this instruction, the E register is addressed with register
addressing, while the constant X’7C is immediate data in the
second byte of the instruction.
11.4 IMMEDIATE EXTENDED
As immediate addressing allows 8 bits of data to be sup-
plied by the operand, immediate extended addressing al-
lows 16 bits of data to be supplied by the operand. These
are in two additional bytes of the instruction.
Example:
Instruction: Load the 16-bit IX register with the constant
value X’ABCD.
Mnemonic: LD
IX,X’ABCD
Opcode:
TL/C/5171–53
In this instruction, register addressing selects the IX regis-
ter, while the 16-bit quanity X’ABCD is immediate data sup-
plied as immediate extended format.
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NSC800E | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC800N | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC800V | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC858 | NSC858 Universal Asynchronous Receiver/Transmitter |
| NSC858D | NSC858 Universal Asynchronous Receiver/Transmitter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NSC800D/883C | 制造商: 功能描述: 制造商:undefined 功能描述: |
| NSC800D/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| NSC800D-1I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
| NSC800D-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
| NSC800D-3/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
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