參數(shù)資料
型號： AT89S4051-24SU
廠商： Atmel
文件頁數(shù)： 10/46頁
文件大小： 0K
描述： IC 8051 MCU FLASH 4K LF 20SOIC
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 38
系列： 89S
核心處理器： 8051
芯體尺寸： 8-位
速度： 24MHz
連通性： UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM
輸入/輸出數(shù)： 15
程序存儲器容量： 4KB（4K x 8）
程序存儲器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
其它名稱： Q2962974
18
3390E–MICRO–6/08
AT89S2051/S4051
18. Analog Comparator
A single analog comparator is provided in the AT89S2051/S4051. The comparator operation is
such that the output is a logical “1” when the positive input AIN0 (P1.0]) is greater than the neg-
ative input AIN1 (P1.1). Otherwise the output is a zero. Setting the CEN bit in ACSR enables the
comparator. When the comparator is first enabled, the comparator output and interrupt flag are
not guaranteed to be stable for 10 microseconds. The corresponding comparator interrupt
should not be enabled during that time, and the comparator interrupt flag must be cleared before
the interrupt is enabled in order to prevent an immediate interrupt service.
The comparator may be configured to cause an interrupt under a variety of output value condi-
tions by setting the CM bits in ACSR. The comparator interrupt flag CF in ACSR is set whenever
the comparator output matches the condition specified by CM. The flag may be polled by soft-
ware or may be used to generate an interrupt and must be cleared by software. The analog
comparator is always disabled during Idle or Power-down modes.
19. Comparator Interrupt with Debouncing
The comparator output is sampled at every State 4 (S4) of every machine cycle. The conditions
on the analog inputs may be such that the comparator output will toggle excessively. This is
especially true if applying slow moving analog inputs. Three debouncing modes are provided to
filter out this noise. In debouncing mode, the comparator uses Timer 1 to modulate its sampling
time. When a relevant transition occurs, the comparator waits until two Timer 1 overflows have
occurred before resampling the output. If the new sample agrees with the expected value, CF is
set. Otherwise, the event is ignored. The filter may be tuned by adjusting the timeout period of
Timer 1. Because Timer 1 is free running, the debouncer must wait for two overflows to guaran-
tee that the sampling delay is at least 1 timeout period. Therefore after the initial edge event, the
interrupt may occur between 1 and 2 timeout periods later. See Figure 19-1.
Figure 19-1. Example of Negative Edge Comparator Interrupt with Debouncing
Comparator Out
Timer 1 Overflow
CF
START
COMPARE
START
COMPARE
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參數(shù)描述
AT89S4051-24SUR 功能描述:8051 89S Microcontroller IC 8-Bit 24MHz 4KB (4K x 8) FLASH 20-SOIC 制造商:atmel 系列:89S 包裝:管件 零件狀態(tài):有效 核心處理器:8051 核心尺寸:8-位 速度:24MHz 連接性:UART/USART 外設(shè):欠壓檢測/復(fù)位，POR，PWM I/O 數(shù):15 程序存儲容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 容量:- RAM 容量:256 x 8 電壓 - 電源（Vcc/Vdd）:2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器類型:內(nèi)部 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應(yīng)商器件封裝:20-SOIC 標(biāo)準(zhǔn)包裝:37
AT89S4D12-12RC 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S4D12-12RI 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S51-24AC 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 24 MHZ 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
AT89S51-24AI 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 24 MHz 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
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