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| 型号： | MM912G634CM1AE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/349页 |
| 文件大小： | 0K |
| 描述： | IC 48KS12 LIN2XLS/HS ISENSE |
| 标准包装： | 250 |
| 应用： | 自动 |
| 核心处理器： | HCS12 |
| 程序存储器类型： | 闪存（48 kB） |
| 控制器系列： | HCS12 |
| RAM 容量： | 2K x 8 |
| 接口： | LIN |
| 电源电压： | 5.5 V ~ 27 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 包装： | 托盘 |
| 供应商设备封装： | 48-LQFP（7x7） |
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Serial Communication Interface (S08SCIV4)
MM912_634 Advance Information, Rev. 10.0
Freescale Semiconductor
115
(synchronized to the baud rate clock), an additional break character is queued. If the receiving device is another Freescale
Semiconductor SCI, the break characters will be received as 0s in all eight data bits and a framing error (FE = 1) occurs.
When idle-line wake-up is used, a full character time of idle (logic 1) is needed between messages to wake up any sleeping
receivers. Normally, a program would wait for TDRE to become set to indicate the last character of a message has moved to the
transmit shifter, then write 0 and then write 1 to the TE bit. This action queues an idle character to be sent as soon as the shifter
is available. As long as the character in the shifter does not finish while TE = 0, the SCI transmitter never actually releases control
of the TxD pin. If there is a possibility of the shifter finishing while TE = 0, set the general-purpose I/O controls so the pin that is
shared with TxD is an output driving a logic 1. This ensures that the TxD line will look like a normal idle line even if the SCI loses
control of the port pin between writing 0 and then 1 to TE.
The length of the break character is affected by the BRK13 and M bits as shown below.
5.16.3.3
Receiver Functional Description
In this section, the receiver block diagram (Figure 30) is used as a guide for the overall receiver functional description. Next, the
data sampling technique used to reconstruct receiver data is described in more detail. Finally, two variations of the receiver
wake-up function are explained.
The receiver input is inverted by setting RXINV = 1. The receiver is enabled by setting the RE bit in SCIC2. Character frames
consist of a start bit of logic 0, eight (or nine) data bits (LSB first), and a stop bit of logic 1. For information about 9-bit data mode,
refer to Section , “8 and 9-bit data modes". For the remainder of this discussion, we assume the SCI is configured for normal
8-bit data mode.
After receiving the stop bit into the receive shifter, and provided the receive data register is not already full, the data character is
transferred to the receive data register and the receive data register full (RDRF) status flag is set. If RDRF was already set
indicating the receive data register (buffer) was already full, the overrun (OR) status flag 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
SCID. The RDRF flag is cleared automatically by a 2-step sequence which is normally satisfied in the course of the user’s
program that handles receive data. Refer to Section 5.16.3.4, “Interrupts and Status Flags" for more details about flag clearing.
5.16.3.3.1
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 defined 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 flag (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 filled with three logic 1 samples so that a new start bit can be detected almost immediately.
Table 149. Break Character Length
BRK13
M
Break Character Length
0
10 bit times
0
1
11 bit times
1
0
13 bit times
1
14 bit times
相关PDF资料 |
PDF描述 |
|---|---|
| 345-026-540-202 | CARDEDGE 26POS DUAL .100 GREEN |
| AYF333765 | CONN FPC 37POS SMD Y3BW |
| MM912H634CV1AER2 | IC 64KS12 LIN2XLS/HS ISENSE |
| 345-026-540-201 | CARDEDGE 26POS DUAL .100 GREEN |
| 345-026-527-804 | CARDEDGE 26POS DUAL .100 GREEN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MM912G634CM1AER2 | 功能描述:马达/运动/点火控制器和驱动器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MM912G634CV1AE | 功能描述:马达/运动/点火控制器和驱动器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MM912G634CV1AER2 | 功能描述:马达/运动/点火控制器和驱动器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MM912G634CV2AP | 功能描述:马达/运动/点火控制器和驱动器 48KS12 LIN2xLS/HS Isense RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| MM912G634CV2APR2 | 制造商:Freescale Semiconductor 功能描述:Relay Driver 48-Pin LQFP T/R 制造商:Freescale Semiconductor 功能描述:48KS12 LIN2XLS/HS ISENSE - Tape and Reel 制造商:Freescale Semiconductor 功能描述:IC MCU 16BIT 48KB FLASH 48LQFP 制造商:Freescale Semiconductor 功能描述:48KS12 LIN2xLS/HS Isense |
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