参数资料
型号: MC68HC705PD6
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封装: QFP-80
文件页数: 9/165页
文件大小: 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
SERIAL COMMUNICATIONS INTERFACE
MC68HC05PD6
11-4
REV 1.1
11.6
RECEIVE DATA IN (RDI)
Receive data in (RDI) is the serial data which is presented from the input pin via
the SCI to the receive data register (RDR). While waiting for a start bit, the
receiver samples the input at a rate 16 times higher than the set baud rate. This
increased rate is referred to as the RT rate. When the input (idle) line is detected
low, it is tested for three more sample times. If at least two of these three samples
detect a logic low, a valid start bit is assumed to be detected. If in two or more
samples, a logic high is detected, the line is assumed to be idle. The receive clock
generator is controlled by the baud rate register (see Section 11.9.5); however,
the SCI is synchronized by the start bit independent of the transmitter.
Once a valid start bit is detected, the start bit, each data bit, and the stop bit are
each sampled three times. The value of the bit is determined by voting logic, which
takes the value of a majority of samples. A noise ag is set when all three samples
on a valid start bit, data bit, or stop bit do not agree. A noise ag is also set when
the start verication samples do not agree.
11.7
START BIT DETECTION FOLLOWING A FRAMING ERROR
If there has been a framing error (FE) without detection of a break (10 zeros for 8-
bit format or 11 zeros for a 9-bit format), the circuit continues to operate as if there
actually were a stop bit, and the start edge will be placed articially. The last bit
received in the data shift register is inverted to a logic one, and the three logic-one
start qualiers (shown in Figure 11-4) are forced into the sample shift register
during the interval when detection of a start bit is anticipated (see Figure 11-5);
therefore, the start bit will be accepted no sooner than it is anticipated.
If the receiver detects that a break (RDRF=1, FE=1, receiver data register=$00)
produced the framing error, the start bit will not be articially induced, and the
receiver must actually receive a logic one before start. See Figure 11-6.
Figure 11-3. Sampling Technique used on All bits
RDI
previous bit
present bit
samples
next bit
VV
V
8
R
T
10
R
T
9
R
T
16
R
T
1
R
T
1
R
T
16
R
T
相关PDF资料
PDF描述
MC68HC05PE0P 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
MC68HC05PE0CDW 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC05PL4CSD 8-BIT, MROM, 2.56 MHz, MICROCONTROLLER, PDSO28
MC68HC705PL4BDW 8-BIT, OTPROM, 2.56 MHz, MICROCONTROLLER, PDSO28
MC68HC705PL4BCDW 8-BIT, OTPROM, 2.56 MHz, MICROCONTROLLER, PDSO28
相关代理商/技术参数
参数描述
MC68HC705SR3CP 功能描述:IC MCU 3.75K 2.1MHZ OTP 40-DIP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C,IrDA,LIN,SPI,UART/USART 外围设备:DMA,PDR,POR,PVD,PWM,温度传感器,WDT 输入/输出数:26 程序存储器容量:64KB(64K x 8) 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN,36-VFQFPN 包装:托盘 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名称:497-9032STM32F101T8U6-ND
MC68HC705SR3CPE 功能描述:8位微控制器 -MCU 8B MCU 192 BYTES RAM 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
MC68HC705SR3CPE 制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC
MC68HC705SR3PE 功能描述:IC MCU 3.75K 2.1MHZ OTP 40-DIP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:HC05 标准包装:1 系列:AVR® ATmega 核心处理器:AVR 芯体尺寸:8-位 速度:16MHz 连通性:I²C,SPI,UART/USART 外围设备:欠压检测/复位,POR,PWM,WDT 输入/输出数:32 程序存储器容量:32KB(16K x 16) 程序存储器类型:闪存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:44-TQFP 包装:剪切带 (CT) 其它名称:ATMEGA324P-B15AZCT
MC68HC706P6ACDW 制造商:Motorola Inc 功能描述: