參數(shù)資料
型號(hào)： MC9S08DV32CLC
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 227/414頁(yè)
文件大?。?/td> 0K
描述： IC MCU 32K FLASH 2K RAM 32-LQFP
標(biāo)準(zhǔn)包裝： 250
系列： S08
核心處理器： S08
芯體尺寸： 8-位
速度： 40MHz
連通性： CAN，I²C，LIN，SCI，SPI
外圍設(shè)備： LVD，POR，PWM，WDT
輸入/輸出數(shù)： 25
程序存儲(chǔ)器容量： 32KB（32K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 10x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 32-LQFP
包裝： 托盤
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Chapter 14 Serial Communications Interface (S08SCIV4)
MC9S08DV60 Series Data Sheet, Rev 3
302
Freescale Semiconductor
ag is set. If RDRF was already set indicating the receive data register (buffer) was already full, the overrun
(OR) status ag is set and the new data is lost. Because the SCI receiver is double-buffered, the program
has one full character time after RDRF is set before the data in the receive data buffer must be read to avoid
a receiver overrun.
When a program detects that the receive data register is full (RDRF = 1), it gets the data from the receive
data register by reading SCIxD. The RDRF ag is cleared automatically by a 2-step sequence which is
normally satised in the course of the user’s program that handles receive data. Refer to Section 14.3.4,
“Interrupts and Status Flags” for more details about ag clearing.
14.3.3.1
Data Sampling Technique
The SCI receiver uses a 16
× baud rate clock for sampling. The receiver starts by taking logic level samples
at 16 times the baud rate to search for a falling edge on the RxD serial data input pin. A falling edge is
dened as a logic 0 sample after three consecutive logic 1 samples. The 16
× baud rate clock is used to
divide the bit time into 16 segments labeled RT1 through RT16. When a falling edge is located, three more
samples are taken at RT3, RT5, and RT7 to make sure this was a real start bit and not merely noise. If at
least two of these three samples are 0, the receiver assumes it is synchronized to a receive character.
The receiver then samples each bit time, including the start and stop bits, at RT8, RT9, and RT10 to
determine the logic level for that bit. The logic level is interpreted to be that of the majority of the samples
taken during the bit time. In the case of the start bit, the bit is assumed to be 0 if at least two of the samples
at RT3, RT5, and RT7 are 0 even if one or all of the samples taken at RT8, RT9, and RT10 are 1s. If any
sample in any bit time (including the start and stop bits) in a character frame fails to agree with the logic
level for that bit, the noise ag (NF) will be set when the received character is transferred to the receive
data buffer.
The falling edge detection logic continuously looks for falling edges, and if an edge is detected, the sample
clock is resynchronized to bit times. This improves the reliability of the receiver in the presence of noise
or mismatched baud rates. It does not improve worst case analysis because some characters do not have
any extra falling edges anywhere in the character frame.
In the case of a framing error, provided the received character was not a break character, the sampling logic
that searches for a falling edge is lled with three logic 1 samples so that a new start bit can be detected
almost immediately.
In the case of a framing error, the receiver is inhibited from receiving any new characters until the framing
error ag is cleared. The receive shift register continues to function, but a complete character cannot
transfer to the receive data buffer if FE is still set.
14.3.3.2
Receiver Wakeup Operation
Receiver wakeup is a hardware mechanism that allows an SCI receiver to ignore the characters in a
message that is intended for a different SCI receiver. In such a system, all receivers evaluate the rst
character(s) of each message, and as soon as they determine the message is intended for a different
receiver, they write logic 1 to the receiver wake up (RWU) control bit in SCIxC2. When RWU bit is set,
the status ags associated with the receiver (with the exception of the idle bit, IDLE, when RWUID bit is
set) are inhibited from setting, thus eliminating the software overhead for handling the unimportant
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC9S08DV32CLF 功能描述:8位微控制器 -MCU 60K FLASH 4K RAM 48PIN 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
MC9S08DV32CLH 功能描述:8位微控制器 -MCU 60K FLASH 4K RAM 64PIN 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
MC9S08DV32F1CLC 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCS08 Microcontrollers
MC9S08DV32F1CLF 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCS08 Microcontrollers
MC9S08DV32F1CLH 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCS08 Microcontrollers
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