參數(shù)資料
型號： MC68HC11D0CFB2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 2 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁數(shù)： 71/138頁
文件大?。?/td> 1047K
代理商： MC68HC11D0CFB2
Central Processor Unit (CPU)
MC68HC711D3 Data Sheet, Rev. 2.1
38
Freescale Semiconductor
A byte is eight bits wide and can be accessed at any byte location. A word is composed of two consecutive
bytes with the most significant byte at the lower value address. Because the M68HC11 is an 8-bit CPU,
there are no special requirements for alignment of instructions or operands.
3.4 Opcodes and Operands
The M68HC11 Family of microcontrollers uses 8-bit opcodes. Each opcode identifies a particular
instruction and associated addressing mode to the CPU. Several opcodes are required to provide each
instruction with a range of addressing capabilities. Only 256 opcodes would be available if the range of
values were restricted to the number able to be expressed in 8-bit binary numbers.
A 4-page opcode map has been implemented to expand the number of instructions. An additional byte,
called a prebyte, directs the processor from page 0 of the opcode map to one of the other three pages.
As its name implies, the additional byte precedes the opcode.
A complete instruction consists of a prebyte, if any, an opcode, and zero, one, two, or three operands.
The operands contain information the CPU needs for executing the instruction. Complete instructions can
be from one to five bytes long.
3.5 Addressing Modes
Six addressing modes can be used to access memory:
1.
Immediate
2.
Direct
3.
Extended
4.
Indexed
5.
Inherent
6.
Relative
These modes are detailed in the following paragraphs. All modes except inherent mode use an effective
address. The effective address is the memory address from which the argument is fetched or stored or
the address from which execution is to proceed. The effective address can be specified within an
instruction, or it can be calculated.
3.5.1 Immediate
In the immediate addressing mode, an argument is contained in the byte(s) immediately following the
opcode. The number of bytes following the opcode matches the size of the register or memory location
being operated on. There are 2-, 3-, and 4- (if prebyte is required) byte immediate instructions. The
effective address is the address of the byte following the instruction.
3.5.2 Direct
In the direct addressing mode, the low-order byte of the operand address is contained in a single byte
following the opcode, and the high-order byte of the address is assumed to be $00. Addresses $00–$FF
are thus accessed directly, using 2-byte instructions. Execution time is reduced by eliminating the
additional memory access required for the high-order address byte. In most applications, this
256-byte area is reserved for frequently referenced data. In M68HC11 MCUs, the memory map can be
configured for combinations of internal registers, RAM, or external memory to occupy these addresses.
相關(guān)PDF資料
PDF描述
MC68HC11D3CFN2 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC44
MC68HC711D3CP3 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40
MC68HC11D3CFN3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC44
MC68HC11D3CFB1 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
MC68L11D0CFB3 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11D0CFB3 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
MC68HC11D0CFB3R2 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HC11D0CFBE2 功能描述:8位微控制器 -MCU 8B MCU 192 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC68HC11D0CFBE3 功能描述:8位微控制器 -MCU 8B MCU 192RAM 3 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC68HC11D0CFBE3R 功能描述:8位微控制器 -MCU 8B MCU 192RAM 3 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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