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| 型号： | AT89C4051-12PU |
| 厂商： | Atmel |
| 文件页数： | 17/19页 |
| 文件大小： | 0K |
| 描述： | IC MCU 4K FLASH 12MHZ 20-DIP |
| 产品培训模块： | MCU Product Line Introduction |
| 标准包装： | 18 |
| 系列： | 89C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 12MHz |
| 连通性： | UART/USART |
| 外围设备： | 欠压检测/复位，LED，POR |
| 输入/输出数： | 15 |
| 程序存储器容量： | 4KB（4K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 128 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 6 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
7
1001F–MICRO–6/08
AT89C4051
9.
Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. The
mode is invoked by software. The content of the on-chip RAM and all the special functions regis-
ters remain unchanged during this mode. The idle mode can be terminated by any enabled
interrupt or by a hardware reset.
P1.0 and P1.1 should be set to “0” if no external pullups are used, or set to “1” if external
pullups are used.
It should be noted that when idle is terminated by a hardware reset, the device normally
resumes program execution, from where it left off, up to two machine cycles before the internal
reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but
access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a
port pin when Idle is terminated by reset, the instruction following the one that invokes Idle
should not be one that writes to a port pin or to external memory.
10. Power-down Mode
In the power-down mode the oscillator is stopped and the instruction that invokes power-down is
the last instruction executed. The on-chip RAM and Special Function Registers retain their val-
ues until the power-down mode is terminated. The only exit from power-down is a hardware
reset. Reset redefines the SFRs but does not change the on-chip RAM. The reset should not be
activated before V
CC is restored to its normal operating level and must be held active long
enough to allow the oscillator to restart and stabilize.
P1.0 and P1.1 should be set to “0” if no external pullups are used, or set to “1” if external
pullups are used.
11. Brown-out Detection
When V
CC drops below the detection threshold, all port pins (except P1.0 and P1.1) are weakly
pulled high. When V
CC goes back up again, an internal Reset is automatically generated after a
delay of typically 15 msec. The nominal brown-out detection threshold is 2.1V ± 10%.
VCC
2.1V
PORT PIN
INTERNAL RESET
15 msec.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89C4051-12PU-RET | 制造商:Atmel Corporation 功能描述: |
| AT89C4051-12SA | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-Bit Microcontroller with 4K Bytes Flash |
| AT89C4051-12SC | 功能描述:8位微控制器 -MCU 8051 4K FLASH 2.7 TO 5.5V 12MHZ 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 |
| AT89C4051-12SI | 功能描述:8位微控制器 -MCU 8051 4K FLASH 2.7 TO 5.5V 12MHZ 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 |
| AT89C4051-12SU | 功能描述:8位微控制器 -MCU 8051 4K FLASH 2.7 TO 5.5V 12MHZ 4V-5.5V 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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