mcs7820 MosChip, mcs7820 Datasheet - Page 18

• Manufacturer Part Number: mcs7820
• Description: Usb-2.0 To Two Serial Ports
• Manufacturer: MosChip

Page 18
MCS7820
USB-2.0 to Two Serial Ports
Divisor Latch Registers (DLL and 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 and 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:
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]
Bit[2]
Bit[2]
Bit[1]
Bit[1]
Rev.
Bit[0]
Bit[0]
1.2