參數(shù)資料
型號: AT89LP428-20MH
廠商: Atmel
文件頁數(shù): 116/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 32VQFN
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 490
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VFQFN 裸露焊盤
包裝: 托盤
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
+
-------------------------------------------------------------------------------------------------------------
×
=
相關(guān)PDF資料
PDF描述
516-020-000-202 CONN RCPT 20POS RACK & PANEL
516-020-000-402 CONN RACK & PANEL RCPT 20POS
AT91SAM7XC256B-CU-999 IC MCU ARM7 256KB FLASH 100TFBGA
AT91SAM7XC256B-AU-999 IC MCU ARM7 256KB FLASH 100LQFP
AT91SAM7XC128B-CU-999 IC MCU ARM7 128KB FLASH 100TFBGA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89LP51-20MU 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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89LP51-20PU 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 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT