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| 型号： | ST72C171K2B6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | SHRINK, PLASTIC, DIP-32 |
| 文件页数： | 133/152页 |
| 文件大小： | 2156K |
| 代理商： | ST72C171K2B6 |
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ST72C171
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SERIAL COMMUNICATIONS INTERFACE (Cont’d)
7.7.4.2 Transmitter
The transmitter can send data words of either 8 or
9 bits depending on the M bit status. When the M
bit is set, word length is 9 bits and the 9th bit (the
MSB) has to be stored in the T8 bit in the CR1 reg-
ister.
Character Transmission
During an SCI transmission, data shifts out least
significant bit first on the TDO pin. In this mode,
the DR register consists of a buffer (TDR) between
the internal bus and the transmit shift register (see
Figure 47).
Procedure
– Select the M bit to define the word length.
– Select the desired baud rate using the BRR reg-
ister.
– Set the TE bit to assign the TDO pin to the alter-
nate function and to send a idle frame as first
transmission.
– Access the SR register and write the data to
send in the DR register (this sequence clears the
TDRE bit). Repeat this sequence for each data to
be transmitted.
The following software sequence is always to clear
the TDRE bit:
1. An access to the SR register
2. A write to the DR register
The TDRE bit is set by hardware and it indicates
that:
– The TDR register is empty.
– The data transfer is beginning.
– The next data can be written in the DR register
without overwriting the previous data.
This flag generates an interrupt if the TIE bit is set
and the I bit is cleared in the CC register.
When a transmission is taking place, a write in-
struction to the DR register stores the data in the
TDR register which is copied in the shift register at
the end of the current transmission.
When no transmission is taking place, a write in-
struction to the DR register places the data directly
in the shift register, the data transmission starts,
and the TDRE bit is immediately set.
When a frame transmission is complete (after the
stop bit or after the break frame) the TC bit is set
and an interrupt is generated if the TCIE is set and
the I bit is cleared in the CC register.
The following software sequence is always to clear
the TC bit:
1. An access to the SR register
2. A write to the DR register
Note: The TDRE and TC bits are cleared by the
same software sequence.
Break Characters
Setting the SBK bit loads the shift register with a
break character. The break frame length depends
on the M bit (see Figure 48).
As long as the SBK bit is set, the SCI sends break
frames to the TDO pin. After clearing this bit by
software, the SCI inserts a logic 1 bit at the end of
the last break frame to guarantee the recognition
of the start bit of the next frame.
Idle Characters
Setting the TE bit drives the SCI to send an idle
frame before the first data frame.
Clearing and then setting the TE bit during a trans-
mission sends an idle frame after the current word.
Note: Resetting and setting the TE bit causes the
data in the TDR register to be lost. Therefore the
best time to toggle the TE bit is when the TDRE bit
is set, i.e. before writing the next byte in the DR.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72C171K2M6 | 功能描述:8位微控制器 -MCU Flash 8K SPI/SCI 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 |
| ST72C215G2B6 | 功能描述:8位微控制器 -MCU Flash 8K SPI 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 |
| ST72C215G2M3 | 制造商:STMicroelectronics 功能描述:MCU 8-Bit ST7 CISC 8KB Flash 3.3V/5V 28-Pin SO Tube 制造商:STMicroelectronics 功能描述:MCU 8BIT ST7 CISC 8KB FLASH 3.3V/5V 28SOIC - Rail/Tube |
| ST72C215G2M5 | 制造商:STMicroelectronics 功能描述:MCU 8BIT ST7 CISC 8KB FLASH 3.3V/5V 28SOIC - Rail/Tube |
| ST72C215G2M6 | 功能描述:8位微控制器 -MCU Flash 8K SPI 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 |
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