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| 型号： | AT89C4051-12PU |
| 厂商： | Atmel |
| 文件页数： | 18/19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 |
8
1001F–MICRO–6/08
AT89C4051
12. Programming The Flash
The AT89C4051 is shipped with the 4K bytes of on-chip PEROM code memory array in the
erased state (i.e., contents = FFH) and ready to be programmed. The code memory array is pro-
grammed one byte at a time. Once the array is programmed, to re-program any non-blank byte,
the entire memory array needs to be erased electrically.
Internal Address Counter: The AT89C4051 contains an internal PEROM address counter
which is always reset to 000H on the rising edge of RST and is advanced by applying a positive
going pulse to pin XTAL1.
Programming Algorithm: To program the AT89C4051, the following sequence is
recommended.
1.
Power-up sequence:
Apply power between VCC and GND pins
Set RST and XTAL1 to GND
2.
Set pin RST to “H”
Set pin P3.2 to “H”
3.
Apply the appropriate combination of “H” or “L” logic
levels to pins P3.3, P3.4, P3.5, P3.7 to select one of the programming operations
shown in the PEROM Programming Modes table.
To Program and Verify the Array:
4.
Apply data for Code byte at location 000H to P1.0 to P1.7.
5.
Raise RST to 12V to enable programming.
6.
Pulse P3.2 once to program a byte in the PEROM array or the lock bits. The byte-write
cycle is self-timed and typically takes 1.2 ms.
7.
To verify the programmed data, lower RST from 12V to logic “H” level and set pins P3.3
to P3.7 to the appropriate levels. Output data can be read at the port P1 pins.
8.
To program a byte at the next address location, pulse XTAL1 pin once to advance the
internal address counter. Apply new data to the port P1 pins.
9.
Repeat steps 6 through 8, changing data and advancing the address counter for the
entire 4K bytes array or until the end of the object file is reached.
10. Power-off sequence:
set XTAL1 to “L”
set RST to “L”
Turn V
CC power off
Data Polling: The AT89C4051 features Data Polling to indicate the end of a write cycle. During
a write cycle, an attempted read of the last byte written will result in the complement of the writ-
ten data on P1.7. Once the write cycle has been completed, true data is valid on all outputs, and
the next cycle may begin. Data Polling may begin any time after a write cycle has been initiated.
Ready/Busy: The Progress of byte programming can also be monitored by the RDY/BSY output
signal. Pin P3.1 is pulled low after P3.2 goes High during programming to indicate BUSY. P3.1 is
pulled High again when programming is done to indicate READY.
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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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