mcs7840 MosChip, mcs7840 Datasheet - Page 19

• Manufacturer Part Number: mcs7840
• Description: Usb-2.0 To Four Serial Ports
• Manufacturer: MosChip

Rev.
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:
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:
Register:
Description:
Offset:
Permissions:
Access Condition:
Default Value:
1.2
BAUD Rate = Input Clock / (16 * Divisor)
Bit[7]
Bit[7]
DLL
Divisor Latch (Least Signifi cant Byte)
0
Read/Write
LCR[7] = 1
0x01
DLM
Divisor Latch (Most Signifi cant Byte)
1
Read/Write
LCR[7] = 1
0x00
Bit[6]
Bit[6]
Bit[5]
Bit[5]
Least Signifi cant Byte of divisor latch
Most Signifi cant Byte of divisor latch
Bit[4]
Bit[4]
Bit[3]
Bit[3]
USB-2.0 to Four Serial Ports
Bit[2]
Bit[2]
MCS7840
Bit[1]
Bit[1]
Bit[0]
Bit[0]
Page 19