参数资料
型号: AT89LP428-20AU
厂商: Atmel
文件页数: 58/149页
文件大小: 0K
描述: MCU 8051 4K FLASH SPI 32TQFP
产品培训模块: MCU Product Line Introduction
标准包装: 250
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 30
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 32-TQFP
包装: 托盘
16
3654A–MICRO–8/09
AT89LP428/828
5.
Enhanced CPU
The AT89LP428/828 uses an enhanced 8051 CPU that runs at 6 to 12 times the speed of stan-
dard 8051 devices (or 3 to 6 times the speed of X2 8051 devices). The increase in performance
is due to two factors. First, the CPU fetches one instruction byte from the code memory every
clock cycle. Second, the CPU uses a simple two-stage pipeline to fetch and execute instructions
in parallel. This basic pipelining concept allows the CPU to obtain up to 1 MIPS per MHz. A sim-
ple example is shown in Figure 5-1.
Figure 5-1.
Parallel Instruction Fetches and Executions
The MCS-51 instruction set allows for instructions of variable length from 1 to 3 bytes. In a sin-
gle-clock-per-byte-fetch system this means each instruction takes at least as many clocks as it
has bytes to execute. The majority of instructions in the AT89LP428/828 follow this rule: the
instruction execution time in clock cycles equals the number of bytes per instruction with a
few exceptions. Branches and Calls require an additional cycle to compute the target address
and some other complex instructions require multiple cycles. See “Instruction Set Summary” on
page 107 for more detailed information on individual instructions. Figures 5-2 and 5-3 show
examples of 1- and 2-byte instructions.
Figure 5-2.
Single-cycle ALU Operation (Example: INC R0)
System Clock
nth Instruction
(n+1)th Instruction
Fetch
Execute
Fetch
Execute
Fetch
Tn
Tn+1
Tn+2
(n+2)th Instruction
System Clock
Total Execution Time
Register Operand Fetch
T1
T2
T3
ALU Operation Execute
Result Write Back
Fetch Next Instruction
相关PDF资料
PDF描述
AT89LP52-20MU IC MCU 8051 8K FLASH SPI 44VQFN
AT89LP6440-20JU MCU 8051 64K FLASH ISP 44PLCC
AT89LP828-JU IC MCU 8051 8KB FLASH 32PLCC
AT89LS51-16AU IC MCU 4K FLASH 16MHZ 44-TQFP
AT89LS52-16PU IC MCU 8K FLASH 16MHZ 40-DIP
相关代理商/技术参数
参数描述
AT89LP428-20JU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT89LP428-20MH 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT89LP428-20PU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT89LP51-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT89LP51-20JU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT