参数资料
型号: AT89LP828-20JU
厂商: Atmel
文件页数: 116/149页
文件大小: 0K
描述: MCU 8051 8K FLASH SPI 32PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 32
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: 8KB(8K x 8)
程序存储器类型: 闪存
EEPROM 大小: 1K 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-LCC(J 形引线)
包装: 管件
69
3654A–MICRO–8/09
AT89LP428/828
and precision is made by changing the TOP value of the timer. The CCA PWM always uses the
greatest precision allowable for the selected output frequency, as compared to Timer 0 and 1
whose PWMs are fixed at 8-bit precision regardless of frequency.
Figure 13-7. CCA PWM Mode Diagram
13.4.1
Asymmetrical PWM
For Asymmetrical PWM, Timer 2 should be configured for Auto-reload mode and Count Mode 1
(CP/RL2 =0, DCEN = 0, T2CM1-0 = 01B). Asymmetrical PWM uses single slope operation as
shown in Figure 13-8. The timer counts up from BOTTOM to TOP and then restarts from BOT-
TOM. In non-inverting mode, the output CCx is set on the compare match between Timer 2
(TL2, TH2) and the channel data register (CCxL, CCxH), and cleared at BOTTOM. In inverting
mode, the output CCx is cleared on the compare match between Timer 2 and the data register,
and set at BOTTOM. The resulting asymmetrical output waveform is left-edge aligned.
The TOP value in RCAP2L and RCAP2H is double buffered such that the output frequency is
only updated at the TOP to BOTTOM overflow. The channel data register (CCxL, CCxH) is also
double-buffered such that the duty cycle is only updated at the TOP to BOTTOM overflow to pre-
vent glitches. The output frequency and duty cycle for asymmetrical PWM are given by the
following equations:
The extreme compare values represent special cases when generating a PWM waveform. If the
compare value is set equal to (or greater than) TOP, the output will remain low or high for non-
inverting and inverting modes, respectively. If the compare value is set to BOTTOM (0000H), the
output will remain high or low for non-inverting and inverting modes, respectively.
TL2
TH2
CCxL
CCxH
CCCx
Interrupt
CCx (P2.x)
T2CCC
T2CCL
Shadow
CCFx
CIENx
CxM2-0
=
T2CCH
Shadow
f
OUT
Oscillator Frequency
RCAP2H RCAP2L
{,
}
1
+
----------------------------------------------------------------
1
TPS
1
+
---------------------
×
=
Inverting:
Duty Cycle
100%
CCxH CCxL
{,
}
RCAP2H RCAP2L
{,
}
1
+
----------------------------------------------------------------
×
=
Non-Inverting:
Duty Cycle
100%
RCAP2H RCAP2L
{,
}
CCxH CCxL
{,
}
1
+
RCAP2H RCAP2L
{,
}
1
+
-------------------------------------------------------------------------------------------------------------
×
=
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AT89LP828-20MH 功能描述:8位微控制器 -MCU Single Cycle 8051 8K ISP Flash 2.4V-5.5V 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
AT89LP828-20PU 功能描述:8位微控制器 -MCU Single Cycle 8051 8K ISP Flash 2.4V-5.5V 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
AT89LP828-AU 功能描述:8位微控制器 -MCU Single-Cycle 8051 8K ISP Flash, 2.4-5.5V 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
AT89LP828-JU 功能描述:8位微控制器 -MCU Single-Cycle 8051 8K ISP Flash, 2.4-5.5V 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
AT89LP828-PU 功能描述:8位微控制器 -MCU Single-Cycle 8051 8K ISP Flash, 2.4-5.5V 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