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MPC82L54AS2 参数 Datasheet PDF下载

MPC82L54AS2图片预览
型号: MPC82L54AS2
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-bit micro-controller]
分类和应用: 微控制器
文件页数/大小: 74 页 / 1587 K
品牌: MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
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Mode3  
Mode 3 is the same as mode 2 except the baud rate is variable.  
2 SMOD  
Baud Rate (for Mode 3) =  
X
(Timer-1 overflow rate)  
32  
In all four modes, transmission is initiated by any instruction that uses SBUF as a destination  
register. Reception is initiated in mode 0 by the condition RI = 0 and REN = 1. Reception is  
initiated in the other modes by the incoming start bit with 1-to-0 transition if REN=1.  
There are several SFRs related to serial port configuration described as following.  
SFR: SCON (Serial Control)  
Bit-7  
Bit-6  
Bit-5  
Bit-4  
Bit-3  
Bit-2  
Bit-1  
Bit-0  
SM0/FE  
SM1  
SM2  
REN  
TB8  
RB8  
TI  
RI  
FE:= Frame Error bit  
This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by  
valid frames but should be cleared by software. The SMOD0 bit must be set to enable access  
to the FE bit.  
{ SM0, SM1 }:= Used to set operating mode of the serial port.  
{ 0, 0 }:= set the serial port operate under Mode 0  
{ 0, 1 }:= set the serial port operate under Mode 1  
{ 1, 0 }:= set the serial port operate under Mode 2  
{ 1, 1 }:= set the serial port operate under Mode 3  
SM2:= Enable the automatic address recognition feature in mode 2 and 3.  
If SM2=1, RI will not be set unless the received 9th data bit is 1, indicating an address, and  
the received byte is a Given or Broadcast address. In mode1, if SM2=1, RI will not be set  
unless a valid stop Bit was received, and the received byte is a Given or Broadcast  
address.  
REN:= Enable the serial port reception.  
0:= (default)  
Disable the serial port reception.  
1:=  
Enable the serial port reception.  
TB8:= The 9th data bit, which will be transmitted in Mode 2 and Mode 3.  
RB8:= In mode 2 and 3, the received 9th data bit will be put into this bit.  
TI:= Transmitting done flag. After a transmitting has been finished, the hardware will set this bit.  
RI:= Receive done flag. After reception has been finished, the hardware will set this bit.  
36  
MPC82x54A Data Sheet  
MEGAWIN  
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