参数资料
| 型号： | AT89LV55-12JI |
| 厂商： | Atmel |
| 文件页数： | 28/32页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU FLASH 20K 44PLCC |
| 标准包装： | 27 |
| 系列： | 89LV |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 12MHz |
| 连通性： | UART/USART |
| 输入/输出数： | 32 |
| 程序存储器容量： | 20KB（20K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 256 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： | 44-LCC（J 形引线） |
| 包装： | 管件 |
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5
0811E–MICRO–9/08
AT89LV55
4.6
Port 3
Port 3 is an 8-bit bi-directional I/O port with internal pullups. The Port 3 output buffers can
sink/source four TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the inter-
nal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low
will source current (I
IL) because of the pullups.
Port 3 also serves the functions of various special features of the AT89LV55, as shown in the
following table.
Port 3 also receives the highest-order address bit and some control signals for Flash program-
ming and verification.
4.7
RST
Reset input. A high on this pin for two machine cycles while the oscillator is running resets the
device.
4.8
ALE/PROG
Address Latch Enable is an output pulse for latching the low byte of the address during
accesses to external memory. This pin is also the program pulse input (PROG) during Flash
programming.
In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency and may be
used for external timing or clocking purposes. Note, however, that one ALE pulse is skipped dur-
ing each access to external data memory.
If desired, ALE operation can be disabled by setting bit 0 of SFR location 8EH. With the bit set,
ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high.
Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.
4.9
PSEN
Program Store Enable is the read strobe to external program memory.
When the AT89LV55 is executing code from external program memory, PSEN is activated twice
each machine cycle, except that two PSEN activations are skipped during each access to exter-
nal data memory.
Port Pin
Alternate Functions
P3.0
RXD (serial input port)
P3.1
TXD (serial output port)
P3.2
INT0 (external interrupt 0)
P3.3
INT1 (external interrupt 1)
P3.4
T0 (timer 0 external input)
P3.5
T1 (timer 1 external input)
P3.6
WR (external data memory write strobe)
P3.7
RD (external data memory read strobe)
相关PDF资料 |
PDF描述 |
|---|---|
| AT89LV55-12JC | IC 8051 MCU FLASH 20K 44PLCC |
| AT89LV55-12AI | IC 8051 MCU FLASH 20K 44TQFP |
| AT89LV55-12AC | IC 8051 MCU FLASH 20K 44TQFP |
| AT91RM9200-CI-002 | IC ARM9 MCU 256 BGA |
| AT91RM9200-QI-002 | IC ARM9 MCU 208 PQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89LV55-12JU | 功能描述:8位微控制器 -MCU 16K FLASH 8051 MCU - 12MHZ 2.4V-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 |
| AT89LV55-12PC | 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 |
| AT89LV55-12PI | 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 |
| AT89OCD-01 | 功能描述:仿真器/模拟器 Emulator to load/ debug AtmelAT8xC51 RoHS:否 制造商:Blackhawk 产品:System Trace Emulators 工具用于评估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2 |
| AT89RFD-01 | 功能描述:音频 IC 开发工具 MP3 Reference Design Chejudo RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
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