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| 型號： | MC68HC705V8CFU |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數(shù)： | 59/172頁 |
| 文件大小： | 890K |
| 代理商： | MC68HC705V8CFU |
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MOTOROLA
SECTION 16: INSTRUCTION SET
Page 140
MC68HC705V8 Specification Rev. 2.1
16.6.1
IMMEDIATE
In the immediate addressing mode, the operand is contained in the byte immediately
following the opcode. The immediate addressing mode is used to access constants that do
not change during program execution (for example, a constant used to initialize a loop
counter).
16.6.2
DIRECT
In the direct addressing mode, the effective address of the argument is contained in a single
byte following the opcode byte. Direct addressing allows the user to directly address the
lowest 256 bytes in memory with single 2-byte instructions.
16.6.3
EXTENDED
In the extended addressing mode, the effective address of the argument is contained in the
2 bytes following the opcode byte. Instructions with extended addressing mode are capable
of referencing arguments anywhere in memory with a single 3-byte instruction. When using
the Motorola assembler, the user need not specify whether an instruction uses direct or
extended addressing. The assembler automatically selects the shortest form of the
instruction.
16.6.4
RELATIVE
The relative addressing mode is only used in branch instructions. In relative addressing,
the contents of the 8-bit signed offset byte (which is the last byte of the instruction) is added
to the PC if, and only if, the branch conditions are true. Otherwise, control proceeds to the
next instruction. The span of relative addressing is from -128 to +127 from the address of
the next opcode. The programmer need not calculate the offset when using the Motorola
assembler, since it calculates the proper offset and checks to see that it is within the span
of the branch.
16.6.5
INDEXED, NO OFFSET
In the indexed, no offset addressing mode, the effective address of the argument is
contained in the 8-bit index register. This addressing mode can access the first 256
memory locations. These instructions are only one byte long. This mode is often used to
move a pointer through a table or to hold the address of a frequently referenced RAM or I/
O location.
16.6.6
INDEXED, 8-BIT OFFSET
In the indexed, 8-bit offset addressing mode, the effective address is the sum of the
contents of the unsigned 8-bit index register and the unsigned byte following the opcode.
The addressing mode is useful for selecting the Kth element in an element table. With this
2-byte instruction, K would typically be in X with the address of the beginning of the table
in the instruction. As such, tables may begin anywhere within the first 256 addressable
locations and could extend as far as location 510. $1FE is the highest location which can
be accessed in this way.
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For More Information On This Product,
Go to: www.freescale.com
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