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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  
90  
4. Executes the IRET instruction to return from the interrupt-service routine and await  
more data.  
Clear To Send (CTS) Operation  
The CTS pin, if enabled by the CTSE bit of the UART Control 0 register, performs flow  
control on the outgoing transmit datastream. The Clear To Send (CTS) input pin is sam-  
pled one system clock before beginning any new character transmission. To delay trans-  
mission of the next data character, an external receiver must deassert CTS at least one  
system clock cycle before a new data transmission begins. For multiple character trans-  
missions, this action is typically performed during Stop Bit transmission. If CTS deasserts  
in the middle of a character transmission, the current character is sent completely.  
MULTIPROCESSOR (9-bit) Mode  
The UART has a MULTIPROCESSOR (9-bit) mode that uses an extra (9th) bit for selec-  
tive communication when a number of processors share a common UART bus. In MULTI-  
PROCESSOR mode (also referred to as 9-Bit mode), the multiprocessor bit (MP) is  
transmitted immediately following the 8-bits of data and immediately preceding the Stop  
bit(s) as illustrated in Figure 12. The character format is:  
Data Field  
Stop Bit(s)  
Idle State  
of Line  
lsb  
msb  
Bit7  
1
0
Start  
Bit0  
Bit1  
Bit2  
Bit3  
Bit4  
Bit5  
Bit6  
MP  
1
2
Figure 12.UART Asynchronous MULTIPROCESSOR Mode Data Format  
In MULTIPROCESSOR (9-bit) mode, the Parity bit location (9th bit) becomes the Multi-  
processor control bit. The UART Control 1 and Status 1 registers provide MULTIPRO-  
CESSOR (9-bit) mode control and status information. If an automatic address matching  
scheme is enabled, the UART Address Compare register holds the network address of the  
device.  
MULTIPROCESSOR (9-bit) Mode Receive Interrupts  
When MULTIPROCESSOR mode is enabled, the UART only processes frames addressed  
to it. The determination of whether a frame of data is addressed to the UART can be made  
in hardware, software or some combination of the two, depending on the multiprocessor  
configuration bits. In general, the address compare feature reduces the load on the CPU,  
because it does not require access to the UART when it receives data directed to other  
PS024705-0405  
P R E L I M I N A R Y  
UART