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Z8F082ASH020SC 参数 Datasheet PDF下载

Z8F082ASH020SC图片预览
型号: Z8F082ASH020SC
PDF下载: 下载PDF文件 查看货源
内容描述: Z8喝采XP -R F08xA系列与扩展外设 [Z8 Encore XP-R F08xA Series with eXtended Peripherals]
分类和应用: 微控制器和处理器外围集成电路光电二极管时钟
文件页数/大小: 244 页 / 2750 K
品牌: ZILOG [ ZILOG, INC. ]
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Z8 Encore! XP® F08xA Seriess  
Product Specification  
92  
asserts at least one UART bit period and no greater than two UART bit periods before the  
Start bit is transmitted. This allows a setup time to enable the transceiver. The Driver  
Enable signal deasserts one system clock period after the final Stop bit is transmitted. This  
one system clock delay allows both time for data to clear the transceiver before disabling  
it, as well as the ability to determine if another character follows the current character. In  
the event of back to back characters (new data must be written to the Transmit Data Regis-  
ter before the previous character is completely transmitted) the DE signal is not deasserted  
between characters. The Depol bit in the UART Control Register 1 sets the polarity of the  
Driver Enable signal.  
1
DE  
0
Data Field  
Stop Bit  
Idle State  
of Line  
lsb  
msb  
Bit7  
1
0
Start  
Bit0  
Bit1  
Bit2  
Bit3  
Bit4  
Bit5  
Bit6  
Parity  
1
Figure 13.UART Driver Enable Signal Timing (shown with 1 Stop Bit and Parity)  
The Driver Enable to Start bit setup time is calculated as follows:  
1
2
-------------------------------------  
-------------------------------------  
DE to Start Bit Setup Time (s) ≤  
Baud Rate (Hz)  
Baud Rate (Hz)  
UART Interrupts  
The UART features separate interrupts for the transmitter and the receiver. In addition,  
when the UART primary functionality is disabled, the Baud Rate Generator can also func-  
tion as a basic timer with interrupt capability.  
Transmitter Interrupts  
The transmitter generates a single interrupt when the Transmit Data Register Empty bit  
(TDRE) is set to 1. This indicates that the transmitter is ready to accept new data for trans-  
mission. The TDRE interrupt occurs after the Transmit shift register has shifted the first  
bit of data out. The Transmit Data register can now be written with the next character to  
send. This action provides 7 bit periods of latency to load the Transmit Data register  
before the Transmit shift register completes shifting the current character. Writing to the  
UART Transmit Data register clears the TDRE bit to 0.  
PS024705-0405  
P R E L I M I N A R Y  
UART