参数资料
型号: AT89LP428-20AU
厂商: Atmel
文件页数: 104/149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
58
3654A–MICRO–8/09
AT89LP428/828
The timer overflow/underflow rate for up-down counting mode is the same as for up counting
mode, provided that the count direction does not change. Changes to the count direction may
result in longer or shorter periods between time-outs.
Figure 12-5. Timer 2 Waveform: Auto-reload Mode (DCEN = 1)
12.3.3
Dual Slope Counter
When Timer 2 Auto-reload mode uses Count Mode 2 (T2CM
1-0 = 10B) or Count Mode 3
(T2CM
1-0 = 11B), the timer operates in a dual slope fashion. The timer counts up from
MIN to TOP and then counts down from TOP to MIN, following a sawtooth waveform as shown
in Figure 12-6. The EXF2 bit is set/cleared by hardware to reflect the current count direction
(Up = 0 and Down = 1). The value of TOP stored in RCAP2H and RCAP2L is double-buffered
such that a new TOP value takes affect only after an underflow. The only difference between
Mode 2 and Mode 3 is when the interrupt flag is set. In Mode 2, TF2 is set once per count period
when the timer underflows at MIN. In Mode 3, TF2 is set twice per count period, once when the
timer overflows at TOP and once when the timer underflows at MIN. The interrupt service routine
can check the EXF2 bit to determine if TF2 was set at TOP or MIN. These count modes are pro-
vided to support variable precision symmetrical PWM in the CCA. DCEN has no effect when
using dual slope operation. The Timer 2 overflow rate for this mode is given in the following
equation:
Max
Min
Bottom
T2CM1-0 = 00B, DCEN = 1
Max
Min
Top
T2CM1-0 = 01B, DCEN = 1
T2EX
TF2 Set
EXF2
Auto-Reload Mode:
DCEN = 0, T2CM = 10B
Time-out Period
RCAP2H RCAP2L
{,
}
2
×
Oscillator Frequency
-------------------------------------------------------------------
TPS
1
+
()
×
=
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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