参数资料
型号: AT89C51RC2-RLRUM
厂商: Atmel
文件页数: 65/127页
文件大小: 0K
描述: MCU 8051 32K FLASH 5V 44-VQFP
产品培训模块: MCU Product Line Introduction
标准包装: 1
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,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: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 标准包装
其它名称: AT89C51RC2-RLRUMDKR
42
AT89C51RB2/RC2
4180E–8051–10/06
Pulse Width Modulator
Mode
All of the PCA Modules can be used as PWM outputs. Figure 16 shows the PWM func-
tion. The frequency of the output depends on the source for the PCA timer. All of the
Modules will have the same frequency of output because they all share the PCA timer.
The duty cycle of each Module is independently variable using the module's capture
register CCAPLn. When the value of the PCA CL SFR is less than the value in the mod-
ule's CCAPLn SFR the output will be low, when it is equal to or greater than the output
will be high. When CL overflows from FF to 00, CCAPLn is reloaded with the value in
CCAPHn. This allows updating the PWM without glitches. The PWM and ECOM bits in
the module's CCAPMn register must be set to enable the PWM mode.
Figure 16. PCA PWM Mode
PCA Watchdog Timer
An on-board watchdog timer is available with the PCA to improve the reliability of the
system without increasing chip count. Watchdog timers are useful for systems that are
susceptible to noise, power glitches, or electrostatic discharge. Module 4 is the only
PCA Module that can be programmed as a watchdog. However, this Module can still be
used for other modes if the watchdog is not needed. Figure 14 shows a diagram of how
the watchdog works. The user pre-loads a 16-bit value in the compare registers. Just
like the other compare modes, this 16-bit value is compared to the PCA timer value. If a
match is allowed to occur, an internal reset will be generated. This will not cause the
RST pin to be driven high.
In order to hold off the reset, the user has the following three options:
1.
Periodically change the compare value so it will never match the PCA timer.
2.
Periodically change the PCA timer value so it will never match the compare
values.
3.
Disable the watchdog by clearing the WDTE bit before a match occurs and then
re-enable it.
The first two options are more reliable because the watchdog timer is never disabled as
in option #3. If the program counter ever goes astray, a match will eventually occur and
cause an internal reset. The second option is also not recommended if other PCA Mod-
ules are being used. Remember, the PCA timer is the time base for all modules;
CL
CCAPnH
CCAPnL
ECOMn
CCAPMn, n = 0 to 4
0xDA to 0xDE
CAPNn MATn TOGn PWMn ECCFn
CAPPn
8-bit Comparator
CEXn
“0”
“1”
Enable
PCA Counter/Timer
Overflow
相关PDF资料
PDF描述
516-038-000-151 CONN PLUG 38POS RACK & PANEL
DSPIC30F4013-20I/PT IC DSPIC MCU/DSP 48K 44TQFP
DSPIC30F4013-30I/PT IC DSPIC MCU/DSP 48K 44TQFP
516-090-000-421 CONN RCPT 90POS RACK & PANEL
516-090-000-411 CONN RCPT 90POS RACK & PANEL
相关代理商/技术参数
参数描述
AT89C51RC2-RLTCM 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 16K/ 32K Bytes Flash
AT89C51RC2-RLTIL 功能描述:8位微控制器 -MCU 80C31 w/4k 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
AT89C51RC2-RLTIM 功能描述:IC 8051 MCU FLASH 32K 44VQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:89C 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
AT89C51RC2RLTUL 制造商:Atmel Corporation 功能描述:
AT89C51RC2-RLTUL 功能描述:8位微控制器 -MCU C51RC2 FLASH 32k 5V Ind 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