参数资料
型号: AT80C51RD2-SLSUM
厂商: Atmel
文件页数: 28/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
标准包装: 972
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-PLCC
包装: 管件
34
4113D–8051–01/09
AT80C51RD2
11. Serial I/O Port
The serial I/O port in the AT80C51RD2 is compatible with the serial I/O port in the 80C52.
It provides both synchronous and asynchronous communication modes. It operates as a Univer-
sal Asynchronous Receiver and Transmitter (UART) in three full-duplex modes (Modes 1, 2 and
3). Asynchronous transmission and reception can occur simultaneously and at different baud
rates
Serial I/O port includes the following enhancements:
Framing error detection
Automatic address recognition
11.1
Framing Error Detection
Framing bit error detection is provided for the three asynchronous modes (modes 1, 2 and 3). To
enable the framing bit error detection feature, set SMOD0 bit in PCON register (see Figure 11-
Figure 11-1. Framing Error Block diagram
When this feature is enabled, the receiver checks each incoming data frame for a valid stop bit.
An invalid stop bit may result from noise on the serial lines or from simultaneous transmission by
two CPUs. If a valid stop bit is not found, the Framing Error bit (FE) in SCON register (see Table
11-4) bit is set.
Software may examine FE bit after each reception to check for data errors. Once set, only soft-
ware or a reset can clear FE bit. Subsequently, received frames with valid stop bits cannot clear
FE bit. When FE feature is enabled, RI rises on stop bit instead of the last data bit (see Figure
Figure 11-2. UART Timings in Mode 1
RI
TI
RB8
TB8
RE N
SM 2
SM 1
SM 0/FE
IDL
PD
GF0
GF1
PO F
-
SM OD0
SM OD1
To UA RT fra min g e rro r co nt ro l
SM 0 to UA RT m o de con tro l (SM OD0 = 0 )
Se t FE bit if stop bit is 0 (fram ing erro r) (SM OD0 = 1)
SCO N (9 8h )
PCON (87 h)
1
Data byte
RI
SMOD0=X
Stop
bit
Start
bit
RXD
D7
D6
D5
D4
D3
D2
D1
D0
FE
SMOD0=1
相关PDF资料
PDF描述
AT89LP51-20MU MCU 8051 4K FLASH 20MHZ 7X7MLF
AT80C51RD2-RLTUM IC 8051 MCU 5V SPI 20MHZ 44-VQFP
AT89S52-24JU IC MCU 8K FLASH 24MHZ 44-PLCC
AT89S52-24PU IC MCU 8K FLASH 24MHZ 40-DIP
200875-1 CONN FIXED JACKSCREW FMLE W/HDWR
相关代理商/技术参数
参数描述
AT80C51SND1C 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
AT80C51SND1C-7HTIL 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Guman Interface
AT80C51SND1C-7HTJL 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
AT80C51SND1C-DDV 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Single-Chip Flash Microcontroller with MP3 Decoder and Guman Interface
AT80C51SND1C-ROTIL 功能描述:IC MCU FLASH MP3 DECODER 80-TQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:80C 标准包装:1,500 系列:AVR® ATtiny 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C,LIN,SPI,UART/USART,USI 外围设备:欠压检测/复位,POR,PWM,温度传感器,WDT 输入/输出数:16 程序存储器容量:8KB(4K x 16) 程序存储器类型:闪存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 11x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:20-SOIC(0.295",7.50mm 宽) 包装:带卷 (TR)