参数资料
型号: AT80C51RD2-RLTUM
厂商: Atmel
文件页数: 81/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-VQFP
标准包装: 800
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
9
4113D–8051–01/09
AT80C51RD2
6.
Enhanced Features
In comparison to the original 80C52, the microcontrollers implement the following new features:
X2 option
Dual Data Pointer
Extended RAM
Programmable Counter Array (PCA)
Hardware Watchdog
4-level Interrupt Priority System
Power-off Flag
Power On Reset
ONCE mode
ALE disabling
Some enhanced features are also located in the UART and the Timer 2
6.1
X2 Feature and OSC Clock Generation
The microcontroller core needs only 6 clock periods per machine cycle. This feature called ”X2”
provides the following advantages:
Divides frequency crystals by 2 (cheaper crystals) while keeping same CPU power.
Saves power consumption while keeping same CPU power (oscillator power saving).
Saves power consumption by dividing dynamically the operating frequency by 2 in operating
and idle modes.
Increases CPU power by 2 while keeping same crystal frequency.
In order to keep the original C51 compatibility, a divider by 2 is inserted between the XTAL1 sig-
nal and the main clock input of the core (phase generator). This divider may be disabled by
software.
6.1.1
Description
The clock for the whole circuit and peripherals is first divided by two before being used by the
CPU core and the peripherals.
This allows any cyclic ratio to be accepted on XTAL1 input. In X2 mode, as this divider is
bypassed, the signals on XTAL1 must have a cyclic ratio between 40 to 60%.
Figure 6-1 shows the clock generation block diagram. X2 bit is validated on the rising edge of
the XTAL1
÷ 2 to avoid glitches when switching from X2 to standard mode. Figure 6-2 shows the
switching mode waveforms.
Figure 6-1.
Clock Generation Diagram
XTAL1
2
CKCON0
X2
8-bit Prescaler
F
OSC
F
XTAL
0
1
XTAL1:2
CKRL
CLK Periph
CLK CPU
Idle
相关PDF资料
PDF描述
AT89S52-24JU IC MCU 8K FLASH 24MHZ 44-PLCC
AT89S52-24PU IC MCU 8K FLASH 24MHZ 40-DIP
200875-1 CONN FIXED JACKSCREW FMLE W/HDWR
202174-4 CONN GUIDE SKT CORNER 104CF POS
202173-1 CONN GUIDE PIN CORNER 104CF POS
相关代理商/技术参数
参数描述
AT80C51RD2-SLRUM 功能描述:8位微控制器 -MCU MCU 8-Bit HI Perform ROMless 3-5V 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
AT80C51RD2-SLSCM 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller
AT80C51RD2-SLSIL 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller
AT80C51RD2-SLSIM 功能描述:IC MCU 8051 5V SPI 20MHZ 44-PLCC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:80C 标准包装:9 系列:87C 核心处理器:8051 芯体尺寸:8-位 速度:40/20MHz 连通性:UART/USART 外围设备:POR,WDT 输入/输出数:32 程序存储器容量:32KB(32K x 8) 程序存储器类型:OTP EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:0°C ~ 70°C 封装/外壳:40-DIP(0.600",15.24mm) 包装:管件
AT80C51RD2-SLSUL 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller