参数资料
型号: MC68HSR705J1AP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 104/162页
文件大小: 3213K
代理商: MC68HSR705J1AP
Technical Data
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
Central Processor Unit (CPU)
3.2 Introduction
The central processor unit (CPU) consists of a CPU control unit, an
arithmetic/logic unit (ALU), and five CPU registers. The CPU control unit
fetches and decodes instructions. The ALU executes the instructions.
The CPU registers contain data, addresses, and status bits that reflect
the results of CPU operations. See Figure 3-1.
Features include:
2.1-MHz bus frequency
8-bit accumulator
8-bit index register
11-bit program counter
6-bit stack pointer
Condition code register (CCR) with five status flags
62 instructions
Eight addressing modes
Power-saving stop, wait, halt, and data-retention modes
3.3 CPU Control Unit
The CPU control unit fetches and decodes instructions during program
operation. The control unit selects the memory locations to read and
write and coordinates the timing of all CPU operations.
3.4 Arithmetic/Logic Unit
The arithmetic/logic unit (ALU) performs the arithmetic, logic, and
manipulation operations decoded from the instruction set by the CPU
control unit. The ALU produces the results called for by the program and
sets or clears status and control bits in the condition code register
(CCR).
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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