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参数资料
型号： AT89S4051-24PU
厂商： ATMEL CORP
元件分类： 微控制器/微处理器
英文描述： 8-bit Microcontroller with 2K/4K Bytes Flash
中文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20
封装： 0.300 INCH, GREEN, MS-001AD, PLASTIC, DIP-20
文件页数： 15/45页
文件大小： 981K
代理商： AT89S4051-24PU
15
3390C–MICRO–7/05
AT89S2051/S4051
TL1 will always count from 00h to FFh. The output on the Timer 1 (T1) pin will be high from when
TL1 equals 00h until TL1 equals TH1 (see
Figure 16-3
). TH1 does not act as the reload value for
TL1 on overflow. Instead, TH1 is used strictly as a compare value (see
Figure 16-2
).
Figure 16-3.
Example of a PWM Output
17. UART
The UART in the AT89S2051/S4051 operates the same way as the UART in the
AT89C2051/C4051. For more detailed information on the UART operation, please click on the
document link below:
17.1
Enhanced UART
In addition to all of its usual modes, the UART can perform framing error detection by looking for
missing stop bits, and automatic address recognition. The UART also fully supports multiproces-
sor communication as does the standard 80C51 UART.
When used for framing error detect, the UART looks for missing stop bits in the communication.
A missing bit will set the FE bit in the SCON register. The FE bit shares the SCON.7 bit with SM0
and the function of SCON.7 is determined by PCON.6 (SMOD0). If SMOD0 is set then SCON.7
functions as FE. SCON.7 functions as SM0 when SMOD0 is cleared. When used as FE,
SCON.7 can only be cleared by software.
17.2
Automatic Address Recognition
Automatic Address Recognition is a feature which allows the UART to recognize certain
addresses in the serial bit stream by using hardware to make the comparisons. This feature
saves a great deal of software overhead by eliminating the need for the software to examine
every serial address which passes by the serial port. This feature is enabled by setting the SM2
bit in SCON. In the 9-bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will
be automatically set when the received byte contains either the “Given” address or the “Broad-
cast” address. The 9-bit mode requires that the 9th information bit is a 1 to indicate that the
received information is an address and not data.
The 8-bit mode is called mode 1. In this mode the RI flag will be set if SM2 is enabled and the
information received has a valid stop bit following the 8 address bits and the information is either
a Given or Broadcast address.
Mode 0 is the Shift Register mode and SM2 is ignored.
Using the Automatic Address Recognition feature allows a master to selectively communicate
with one or more slaves by invoking the given slave address or addresses. All of the slaves may
be contacted by using the Broadcast address. Two special Function Registers are used to
define the slave’s address, SADDR, and the address mask, SADEN. SADEN is used to define
which bits in the SADDR are to be used and which bits are “don’t care”. The SADEN mask can
00 01 10 . . . TH1 . . . FF 00 . . .
TL1 Count
T1
相关PDF资料
PDF描述
AT89S4051-24SC 8-bit Microcontroller with 2K/4K Bytes Flash
AT89S4051-24SI 8-bit Microcontroller with 2K/4K Bytes Flash
AT89S4051-24SU 8-bit Microcontroller with 2K/4K Bytes Flash
AT89S4D12 8-Bit Microcontroller with 132K Bytes Flash Data Memory
AT89S4D12-12JC 8-Bit Microcontroller with 132K Bytes Flash Data Memory
相关代理商/技术参数
参数描述
AT89S4051-24SU 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ 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
AT89S4051-24SUR 功能描述:8051 89S Microcontroller IC 8-Bit 24MHz 4KB (4K x 8) FLASH 20-SOIC 制造商:atmel 系列:89S 包装:管件 零件状态:有效 核心处理器:8051 核心尺寸:8-位 速度:24MHz 连接性:UART/USART 外设:欠压检测/复位，POR，PWM I/O 数:15 程序存储容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:256 x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 5.5 V 数据转换器:- 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商器件封装:20-SOIC 标准包装:37
AT89S4D12-12RC 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
AT89S4D12-12RI 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
AT89S51-24AC 功能描述:8位微控制器 -MCU 4K ISP FLASH 2.7 TO 5.5V - 24 MHZ 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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