参数资料
| 型号： | AT80C51RD2-SLSUM |
| 厂商： | Atmel |
| 文件页数： | 81/81页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU 5V SPI 20MHZ 44-PLCC |
| 标准包装： | 972 |
| 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-PLCC |
| 包装： | 管件 |
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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 |
|---|---|
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| AT89S52-24PU | IC MCU 8K FLASH 24MHZ 40-DIP |
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| AT80C51SND1C | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface |
| AT80C51SND1C-7HTIL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Guman Interface |
| AT80C51SND1C-7HTJL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface |
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| AT80C51SND1C-ROTIL | 功能描述:IC MCU FLASH MP3 DECODER 80-TQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:80C 标准包装:1,500 系列:AVR® ATtiny 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C，LIN，SPI，UART/USART，USI 外围设备:欠压检测/复位，POR，PWM，温度传感器，WDT 输入/输出数:16 程序存储器容量:8KB（4K x 16） 程序存储器类型:闪存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 11x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 包装:带卷 (TR) |
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