參數(shù)資料
型號(hào): AT89LP428-20MH
廠商: Atmel
文件頁數(shù): 118/149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(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)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
70
3654A–MICRO–8/09
AT89LP428/828
Figure 13-8. Asymmetrical (Edge-Aligned) PWM
13.4.2
Symmetrical PWM
For Symmetrical PWM, Timer 2 should be configured for Auto-reload mode and Count Mode 2
or 3 (CP/RL2 = 0, DCEN = 0, T2CM1-0 =1xB). Symmetrical PWM uses dual-slope operation as
shown in Figure 13-9. The timer counts up from MIN to TOP and then counts down from TOP to
MIN. The timer is equal to TOP for exactly one clock cycle. In non-inverting mode, the output
CCx is cleared on the up-count compare match between Timer 2 (TL2, TH2) and the channel
data register (CCxL, CCxH), and set at the down-count compare match. In inverting mode, the
output CCx is set on the up-count compare match between Timer 2 and the data register, and
cleared at the down-count compare match. The resulting symmetrical PWM output waveform is
center-aligned around the timer equal to TOP point. Symmetrical PWM may be used to generate
non-overlapping waveforms.
The TOP value in RCAP2L and RCAP2H is double buffered such that the output frequency is
only updated at the underflow. The channel data register (CCxL, CCxH) is also double-buffered
to prevent glitches. The output frequency and duty cycle for symmetrical 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 high or low for non-
inverting and inverting modes, respectively. If the compare value is set to MIN (0000H), the out-
put will remain low or high for non-inverting and inverting modes, respectively.
{RCAP2H,RCA2L}
CP/RL2 = 0, T2CM1-0 = 01B, DCEN = 0
Inverted
{CCxH,CCxL}
Non-inverted
CCx
f
OUT
Oscillator Frequency
2
RCAP2H RCAP2L
{,
}
×
-----------------------------------------------------------------
1
TPS
1
+
---------------------
×
=
Non-Inverting:
Duty Cycle
100%
CCxH CCxL
{,
}
RCAP2H RCAP2L
{,
}
------------------------------------------------------
×
=
Inverting:
Duty Cycle
100%
RCAP2H RCAP2L
{,
}
CCxH CCxL
{,
}
RCAP2H RCAP2L
{,
}
---------------------------------------------------------------------------------------------------
×
=
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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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
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