参数资料
| 型号： | AT89C51-24PC |
| 厂商： | Atmel |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC MICRO CTRL 24MHZ 40DIP |
| 标准包装： | 9 |
| 系列： | 89C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 24MHz |
| 连通性： | UART/USART |
| 输入/输出数： | 32 |
| 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)： | 4 V ~ 6 V |
| 振荡器型： | 内部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 包装： | 管件 |
AT89C51
3
The AT89C51 provides the following standard features: 4K
bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit
timer/counters, a five vector two-level interrupt architecture,
a full duplex serial port, on-chip oscillator and clock cir-
cuitry. In addition, the AT89C51 is designed with static logic
for operation down to zero frequency and supports two
software selectable power saving modes. The Idle Mode
stops the CPU while allowing the RAM, timer/counters,
serial port and interrupt system to continue functioning. The
Power-down Mode saves the RAM contents but freezes
the oscillator disabling all other chip functions until the next
hardware reset.
Pin Description
VCC
Supply voltage.
GND
Ground.
Port 0
Port 0 is an 8-bit open-drain bi-directional I/O port. As an
output port, each pin can sink eight TTL inputs. When 1s
are written to port 0 pins, the pins can be used as high-
impedance inputs.
Port 0 may also be configured to be the multiplexed low-
order address/data bus during accesses to external pro-
gram and data memory. In this mode P0 has internal
pullups.
Port 0 also receives the code bytes during Flash program-
ming , and outputs the code bytes du ring program
verification. External pullups are required during program
verification.
Port 1
Port 1 is an 8-bit bi-directional I/O port with internal pullups.
The Port 1 output buffers can sink/source four TTL inputs.
When 1s are written to Port 1 pins they are pulled high by
the internal pullups and can be used as inputs. As inputs,
Port 1 pins that are externally being pulled low will source
current (I
IL) because of the internal pullups.
Port 1 also receives the low-order address bytes during
Flash programming and verification.
Port 2
Port 2 is an 8-bit bi-directional I/O port with internal pullups.
The Port 2 output buffers can sink/source four TTL inputs.
When 1s are written to Port 2 pins they are pulled high by
the internal pullups and can be used as inputs. As inputs,
Port 2 pins that are externally being pulled low will source
current (I
IL) because of the internal pullups.
Port 2 emits the high-order address byte during fetches
from external program memory and during accesses to
external data memory that use 16-bit addresses (MOVX @
DPTR). In this application, it uses strong internal pullups
when emitting 1s. During accesses to external data mem-
ory that use 8-bit addresses (MOVX @ RI), Port 2 emits the
contents of the P2 Special Function Register.
Port 2 also receives the high-order address bits and some
control signals during Flash programming and verification.
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 internal pullups and can be used as inputs. As inputs,
Port 3 pins that are externally being pulled low will source
current (IIL) because of the pullups.
Port 3 also serves the functions of various special features
of the AT89C51 as listed below:
Port 3 also receives some control signals for Flash pro-
gramming and verification.
RST
Reset input. A high on this pin for two machine cycles while
the oscillator is running resets the device.
ALE/PROG
Address Latch Enable 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 tim-
ing or clocking purposes. Note, however, that one ALE
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)
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相关代理商/技术参数 |
参数描述 |
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| AT89C5124PC SL557 | 制造商:Atmel Corporation 功能描述:8-bit microcontroller with 4K bytes flash |
| AT89C51-24PI | 功能描述:8位微控制器 -MCU RO 556-AT89S51-24PI 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 |
| AT89C51-24QC | 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 |
| AT89C51-24QI | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with 4K Bytes Flash |
| AT89C5130A-DDW | 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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