參數(shù)資料
型號: ST7PLU05MAE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8
封裝: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁數(shù): 41/124頁
文件大?。?/td> 1995K
代理商: ST7PLU05MAE
ST7LUS5, ST7LU05, ST7LU09
Central processing unit
5
Central processing unit
5.1
Introduction
This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8-
bit data manipulation.
5.2
Main features
63 basic instructions
Fast 8-bit by 8-bit multiply
17 main addressing modes
Two 8-bit index registers
16-bit stack pointer
Low power modes
Maskable hardware interrupts
Non-maskable software interrupt
5.3
CPU registers
The six CPU registers shown in Figure 6 are not present in the memory mapping and are
accessed by specific instructions.
5.3.1
Accumulator (A)
The Accumulator is an 8-bit general purpose register used to hold operands and the results
of the arithmetic and logic calculations and to manipulate data.
5.3.2
Index registers (X and Y)
In indexed addressing modes, these 8-bit registers are used to create either effective
addresses or temporary storage areas for data manipulation (the Cross-Assembler
generates a precede instruction (PRE) to indicate that the following instruction refers to the
Y register).
The Y register is not affected by the interrupt automatic procedures (not pushed to and
popped from the stack).
5.3.3
Program counter (PC)
The program counter is a 16-bit register containing the address of the next instruction to be
executed by the CPU. It is made of two 8-bit registers PCL (Program Counter Low which is
the LSB) and PCH (Program Counter High which is the MSB).
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