參數(shù)資料
型號: AN1218
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HC05 to HC08 Optimization
中文描述: 以HC08的優(yōu)化HC05
文件頁數(shù): 5/56頁
文件大小: 417K
代理商: AN1218
Application Note
CPU05/CPU08 Programmer's Model Comparison
AN1218 Rev. 2
5
HC 05 and HC 08
Addressing Modes
Inherent instructions such as reset stack pointer (RSP) and multiply
(MUL) have no operand. Inherent instructions require no memory
address and are one byte long.
Immediate instructions contain a value that is used in an operation with
the index register or accumulator. Immediate instructions require no
memory address and are two bytes long. The operand is found in the
byte immediately following the opcode.
Direct instructions can access any of the first 256 memory addresses
with only two bytes. The first byte contains the opcode followed by the
low byte of the operand address. The CPU automatically uses $00 for
the high byte of the operand address. Most direct instructions are two
bytes long.
Table 1. Addressing Mode Comparison Table
Addressing Mode
HC05
HC08
Inherent
X
X
Immediate
X
X
Direct
X
X
Extended
X
X
Indexed, no offset
X
X
Indexed, 8-bit offset
X
X
Indexed, 16-bit offset
X
X
Relative
X
X
Stack Pointer, 8-bit offset
X
Stack Pointer, 16-bit offset
X
Memory to memory (4 modes)
X
Indexed w/post increment
X
Indexed, 8-bit offset, w/post increment
X
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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