參數(shù)資料
型號(hào)： AT89S8252-24AI
廠商： Atmel
文件頁數(shù)： 10/41頁
文件大?。?/td> 0K
描述： MCU W/SPI 8KB FLSH 2K EEP 44TQFP
標(biāo)準(zhǔn)包裝： 160
系列： 89S
核心處理器： 8051
芯體尺寸： 8-位
速度： 24MHz
連通性： SPI，UART/USART
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大小： 2K x 8
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 托盤
其它名稱： AT89S825224AI
18
AT89S8252
0401G–MICRO–3/06
UART
The UART in the AT89S8252 operates the same way as the UART in the AT89C51 and
AT89C52. For further information on the UART operation, refer to the Atmel web site
(http://www.atmel.com). From the home page, select “Products”, then “Microcontrollers,
then “8051-Architecture”. Click on “Documentation”, then on “Other Documents”. Open
the document “AT89 Series Hardware Description”.
Serial Peripheral
Interface
The serial peripheral interface (SPI) allows high-speed synchronous data transfer
between the AT89S8252 and peripheral devices or between several AT89S8252
devices. The AT89S8252 SPI features include the following:
Full-Duplex, 3-Wire Synchronous Data Transfer
Master or Slave Operation
1.5 MHz Bit Frequency (max.)
LSB First or MSB First Data Transfer
Four Programmable Bit Rates
End of Transmission Interrupt Flag
Write Collision Flag Protection
Wakeup from Idle Mode (Slave Mode Only)
The interconnection between master and slave CPUs with SPI is shown in the following
figure. The SCK pin is the clock output in the master mode but is the clock input in the
slave mode. Writing to the SPI data register of the master CPU starts the SPI clock gen-
erator, and the data written shifts out of the MOSI pin and into the MOSI pin of the slave
CPU. After shifting one byte, the SPI clock generator stops, setting the end of transmis-
sion flag (SPIF). If both the SPI interrupt enable bit (SPIE) and the serial port interrupt
enable bit (ES) are set, an interrupt is requested.
The Slave Select input, SS/P1.4, is set low to select an individual SPI device as a slave.
When SS/P1.4 is set high, the SPI port is deactivated and the MOSI/P1.5 pin can be
used as an input.
There are four combinations of SCK phase and polarity with respect to serial data,
which are determined by control bits CPHA and CPOL. The SPI data transfer formats
are shown in Figure 8 and Figure 9.
Figure 7. SPI Master-slave Interconnection
8-BIT SHIFT REGISTER
MASTER
CLOCK GENERATOR
SPI
MISO
8-BIT SHIFT REGISTER
SLAVE
MISO
MOSI MOSI
SCK
SS
V
CC
MSB
LSB
MSB
LSB
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89S8252-24AU 制造商:Rochester Electronics LLC 功能描述:
AT89S8252-24JC 功能描述:8位微控制器 -MCU 8K Flash 24M RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89S8252-24JI 功能描述:8位微控制器 -MCU 8K Flash 24M RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89S8252-24PC 功能描述:8位微控制器 -MCU 8K Flash 24M RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89S8252-24PI 功能描述:8位微控制器 -MCU w/8k RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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