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参数资料
| 型号： | AT89LV52-12AI |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-Bit Microcontroller with 8K Bytes Flash |
| 中文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, TQFP-44 |
| 文件页数： | 12/22页 |
| 文件大小： | 532K |
| 代理商： | AT89LV52-12AI |
AT89LV52
4-94
Program Memory Lock Bits
The AT89LV52 has three lock bits that can be left unpro-
grammed (U) or can be programmed (P) to obtain the addi-
tional features listed in the following table:
When lock bit 1 is programmed, the logic level at the EA pin
is sampled and latched during reset. If the device is pow-
ered up without a reset, the latch initializes to a random
value and holds that value until reset is activated. The
latched value of EA must agree with the current logic level
at that pin in order for the device to function properly.
Lock Bit Protection Modes
Programming the Flash
The AT89LV52 is normally shipped with the on-chip Flash
memory array in the erased state (that is, contents = FFH)
and ready to be programmed.
The AT89LV52 top-side marking and device signature
codes are listed in the following table.
The AT89LV52 code memory array is programmed byte-
by-byte. To program any non-blank byte in the on-chip
Flash Memory, the entire memory must be erased using
the Chip Erase Mode.
Programming Algorithm:
Before programming the
AT89LV52, the address, data and control signals should be
set up according to the Flash programming mode table and
Figure 9 and Figure 10. To program the AT89LV52, take
the following steps.
1.
Input the desired memory location on the address
lines.
2.
Input the appropriate data byte on the data lines.
3.
Activate the correct combination of control signals.
4.
Raise EA/V
PP
to 12V.
5.
Pulse ALE/PROG once to program a byte in the Flash
array or the lock bits. The byte-write cycle is self-timed
and typically takes no more than 1.5 ms. Repeat steps
1 through 5, changing the address and data for the
entire array or until the end of the object file is reached.
Data Polling:
The AT89LV52 features Data Polling to indi-
cate the end of a write cycle. During a write cycle, an
attempted read of the last byte written will result in the com-
plement of the written data on PO.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.
Program Lock Bits
Protection Type
LB1
LB2
LB3
1
U
U
U
No program lock features.
2
P
U
U
MOVC instructions executed from external program memory are disabled from fetching code
bytes from internal memory, EA is sampled and latched on reset, and further programming of the
Flash memory is disabled.
3
P
P
U
Same as mode 2, but verify is also disabled.
4
P
P
P
Same as mode 3, but external execution is also disabled.
V
PP
= 12V
Top-Side Mark
AT89LV52
xxxx
yyww
Signature
(030H) = 1EH
(031H) = 62H
(032H) = FFH
相关PDF资料 |
PDF描述 |
|---|---|
| AT89LV52-12JC | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LV52 | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LV52-12JI | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LV52-12PC | 8-Bit Microcontroller with 8K Bytes Flash |
| AT89LV52-12PI | 8-Bit Microcontroller with 8K Bytes Flash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89LV52-12JC | 功能描述:8位微控制器 -MCU 80C31 w/8k 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 |
| AT89LV52-12JI | 功能描述:8位微控制器 -MCU 80C31 w/8k 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 |
| AT89LV52-12PC | 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 |
| AT89LV52-12PI | 功能描述:8位微控制器 -MCU 80C31 w/8k 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 |
| AT89LV52-12QC | 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 |
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