參數(shù)資料
型號： AT89LP428-20MH
廠商： Atmel
文件頁數(shù)： 113/149頁
文件大小： 0K
描述： MCU 8051 4K FLASH SPI 32VQFN
產(chǎn)品培訓模塊： MCU Product Line Introduction
標準包裝： 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 大小： 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
66
3654A–MICRO–8/09
AT89LP428/828
Each CCA channel has an associated external capture input pin: CCA (P2.0), CCB (P2.1), CCC
(P2.2) and CCD (P2.3). External capture events are always edge-triggered and can be selected
to occur at a negative edge, positive edge, or both (toggle). Capture inputs are sampled every
clock cycle and a new value must be held for at least 2 clock cycles to be correctly sampled by
the device. The maximum achievable capture rate will be determined by how fast the software
can retrieve the captured data. There is no protection against capture events overrunning the
data register.
Capture events may also be triggered internally by the overflows of Timer 0 or Timer 1, or by an
event from the dual analog comparators. Any comparator event which can generate a compara-
tor interrupt may also be used as a capture event. However, Timer 2 should not be selected as
the comparator clock source when using the comparator as the capture trigger.
13.2.1
Timer 2 Operation for Capture Mode
Capture channels are intended to work with Timer 2 in capture mode CP/RL2 =1. Captures can
still occur when Timer 2 operates in other modes; however, the full 16-bit count range may not
be available. The TF2 flag can be used to determine if the timer overflowed before the capture
occurred. If the timer is operating in dual-slope mode (CP/RL2 =0, T2CM
1-0 =1xB), the count
direction (Up = 0 and Down = 1) at the time of the event will be captured into the channel’s
CDIRx bit in CCCx. CTCx must be cleared to 0 for all channels if Timer 2 is operating in Baud
Rate mode or errors may occur in the serial communication.
13.3
Output Compare Mode
The Compare/Capture Array provides a variety of compare modes suitable for event timing or
waveform generation. The CCA channels are configured for compare mode by setting the CCMx
bit in the associated CCCx register to 1. A compare event occurs when the 16-bit contents of a
channel’s data register match the contents of Timer 2 (TH2 and TL2). The compare event also
sets the channel’s interrupt flag CCFx in T2CCF and may optionally clear Timer 2 to 0000H if the
CTCx bit in CCCx is set. A diagram of a CCA channel in compare mode is shown in Figure 13-3.
Figure 13-3. CCA Compare Mode Diagram
TL2
TH2
CCxL
CCxH
CCCx
Interrupt
CCx (P2.x)
T2CCC
T2CCL
Shadow
00H
CTCx
CCFx
CIENx
CxM2-0
=
T2CCH
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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 安裝風格:SMD/SMT
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