參數(shù)資料
型號(hào)： MCS7840
廠商： Electronic Theatre Controls, Inc.
英文描述： USB-2.0 to Four Serial Ports
中文描述： 的USB 2.0 4個(gè)串行端口
文件頁(yè)數(shù)： 19/41頁(yè)
文件大?。?/td> 447K
代理商： MCS7840
MCS7840
USB-2.0 to Four Serial Ports
Rev.
1.2
Page 19
Divisor Latch Registers (DLL & DLM):
The Divisor Latch Registers are used to program the BAUD Rate divisor.
This is a value between 1 and 65535 by which the input clock is divided in order to generate serial BAUD
rates.
After the hardware reset, the BAUD Rate used by the transmitter & receiver is given by:
BAUD Rate = Input Clock / (16 * Divisor)
where divisor is given by (256 * DLM) + DLL.
More
fl
exible BAUD rate generation options are also available.
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
DLL
Divisor Latch (Least Signi
fi
cant Byte)
0
Read/Write
LCR[7] = 1
0x01
Bit[7]
Bit[6]
Bit[5]
Least Signi
fi
cant Byte of divisor latch
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
DLM
Divisor Latch (Most Signi
fi
cant Byte)
1
Read/Write
LCR[7] = 1
0x00
Bit[7]
Bit[6]
Bit[5]
Bit[4]
Bit[3]
Bit[2]
Bit[1]
Bit[0]
Most Signi
fi
cant Byte of divisor latch
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