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参数资料
| 型号： | AT89S4051-24SU |
| 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, PDSO20 |
| 封装： | 0.300 INCH, GREEN, MS-013AC, PLASTIC, SOIC-20 |
| 文件页数： | 9/45页 |
| 文件大小： | 981K |
| 代理商： | AT89S4051-24SU |
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9
3390C–MICRO–7/05
AT89S2051/S4051
10.2
Brown-out Reset
The AT89S2051/S4051 has an on-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD is
nominally 2.2V. The purpose of the BOD is to ensure that if V
CC
fails or dips while executing at
speed, the system will gracefully enter reset without the possibility of errors induced by incorrect
execution. When V
CC
decreases to a value below the trigger level, the Brown-out Reset is imme-
diately activated. When V
CC
increases above the trigger level, the BOD delay counter starts the
microcontroller after the timeout period has expired in approximately 2 ms.
10.3
External Reset
The RST pin functions as an active-high reset input. The pin must be held high for at least two
machine cycles to trigger the internal reset. RST also serves as the In-System Programming
(ISP) enable input. ISP mode is enabled when the external reset pin is held high and the ISP
Enable fuse is set.
11. Clock Register
.
Table 11-1.
CLKREG
– Clock Register
CLKREG = 8FH
Reset Value = XXXX XX0XB
Not Bit Addressable
–
–
–
–
–
–
PWDEX
X2
Bit
7
6
5
4
3
2
1
0
Symbol
Function
PWDEX
Power-down Exit Mode. When PWDEX = 1, wake up from Power-down is externally controlled. When PWDEX = 0, wake
up from Power-down is internally timed.
X2
When X2 = 0, the frequency (at XTAL1 pin) is internally divided by 2 before it is used as the device system frequency.
When X2 = 1, the divide by 2 is no longer used and the XTAL1 frequency becomes the device system frequency. This
enables the user to use a 6 MHz crystal instead of a 12 MHz crystal in order to reduce EMI. The X2 bit is initialized on
power-up with the value of the X2 user fuse and may be changed at runtime by software.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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 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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