参数资料
| 型号： | AT87C58X2-SLSUL |
| 厂商： | Atmel |
| 文件页数： | 13/62页 |
| 文件大小： | 0K |
| 描述： | IC 8051 MCU 32K EPROM 44PLCC |
| 标准包装： | 972 |
| 系列： | 87C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 30/20MHz |
| 连通性： | UART/USART |
| 外围设备： | POR，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 32KB（32K x 8） |
| 程序存储器类型： | OTP |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 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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20
4431E–8051–04/06
AT/TS8xC54/8X2
Figure 9-3.
UART Timings in Modes 2 and 3
9.1.1
Automatic Address Recognition
The automatic address recognition feature is enabled when the multiprocessor communication
feature is enabled (SM2 bit in SCON register is set).
Implemented in hardware, automatic address recognition enhances the multiprocessor commu-
nication feature by allowing the serial port to examine the address of each incoming command
frame. Only when the serial port recognizes its own address, the receiver sets RI bit in SCON
register to generate an interrupt. This ensures that the CPU is not interrupted by command
frames addressed to other devices.
If desired, you may enable the automatic address recognition feature in mode 1. In this configu-
ration, the stop bit takes the place of the ninth data bit. Bit RI is set only when the received
command frame address matches the device’s address and is terminated by a valid stop bit.
To support automatic address recognition, a device is identified by a given address and a broad-
cast address.
NOTE: The multiprocessor communication and automatic address recognition features cannot
be enabled in mode 0 (i.e. setting SM2 bit in SCON register in mode 0 has no effect).
9.1.2
Given Address
Each device has an individual address that is specified in SADDR register; the SADEN register
is a mask byte that contains don’t-care bits (defined by zeros) to form the device’s given
address. The don’t-care bits provide the flexibility to address one or more slaves at a time. The
following example illustrates how a given address is formed.
To address a device by its individual address, the SADEN mask byte must be 1111 1111b.
For example:
SADDR
0101 0110b
SADEN
1111 1100b
Given
0101 01XXb
RI
SMOD0=0
Data byte
Ninth
bit
Stop
bit
Start
bit
RXD
D8
D7
D6
D5
D4
D3
D2
D1
D0
RI
SMOD0=1
FE
SMOD0=1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT87C58X2-SLSUM | 功能描述:8位微控制器 -MCU OTP C58/32K 40MHZ 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 |
| AT87C58X2-SLSUV | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit CMOS Microcontroller 16/32 Kbytes ROM/OTP |
| AT87F51 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-Bit Microcontroller with 4K Bytes QuickFlash |
| AT87F51-12AC | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-Bit Microcontroller with 4K Bytes QuickFlash |
| AT87F51-12AI | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-Bit Microcontroller with 4K Bytes QuickFlash |
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