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| 型号： | AT89S4051-24PU |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-bit Microcontroller with 2K/4K Bytes Flash |
| 中文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20 |
| 封装： | 0.300 INCH, GREEN, MS-001AD, PLASTIC, DIP-20 |
| 文件页数： | 18/45页 |
| 文件大小： | 981K |
| 代理商： | AT89S4051-24PU |
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18
3390C–MICRO–7/05
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
相关PDF资料 |
PDF描述 |
|---|---|
| AT89S4051-24SC | 8-bit Microcontroller with 2K/4K Bytes Flash |
| AT89S4051-24SI | 8-bit Microcontroller with 2K/4K Bytes Flash |
| AT89S4051-24SU | 8-bit Microcontroller with 2K/4K Bytes Flash |
| AT89S4D12 | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
| AT89S4D12-12JC | 8-Bit Microcontroller with 132K Bytes Flash Data Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89S4051-24SU | 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ 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 |
| 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 包装:管件 零件状态:有效 核心处理器:8051 核心尺寸:8-位 速度:24MHz 连接性:UART/USART 外设:欠压检测/复位，POR，PWM I/O 数:15 程序存储容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:256 x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 5.5 V 数据转换器:- 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商器件封装:20-SOIC 标准包装: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 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 |
| AT89S4D12-12RI | 功能描述:8位微控制器 -MCU Microcontroller 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 |
| 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 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 |
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