mcs7715 MosChip, mcs7715 Datasheet - Page 22
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mcs7715
Manufacturer Part Number
mcs7715
Description
Usb 1.1 To Single Uart And Printer Port
Manufacturer
MosChip
Datasheet
1.MCS7715.pdf
(34 pages)
Page 22
MCS7715
USB 1.1 to Single UART and Printer Port
Divisor Latch Registers:
The divisor latch registers (DLL & DLM) 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 a hardware Reset,
the Baud Rate used by the transmitter & receiver is given by:
where divisor is given by: (256 * DLM ) + DLL
Note: More flexible Baud Rate generation options are also available. These require the use of Advanced
Features in other registers however.
Register:
Description:
Offset:
Permissions:
Access Condition:
Register:
Description:
Offset:
Permissions:
Access Condition:
Baud Rate = Input Clock / 16 * Divisor
Bit[7]
Bit[7]
Baud Rate Generator
Programming Table
DLL
Divisor Latch Register
000
Read/Write
LCR[7] =1, Address = 000
DLM
Divisor Latch Register
001
Read/Write
LCR[7] =1, Address = 001
Bit[6]
Bit[6]
Bit[5]
Bit[5]
Least significant Byte for divisor latch
Most significant Byte for divisor latch
Bit[4]
Bit[4]
Baud Rate
115.2K
Bit[3]
Bit[3]
57.6K
38.4K
19.2K
9600
2400
1200
600
300
150
50
Bit[2]
Bit[2]
(Hex)
DLM
00
00
00
00
00
00
00
00
01
03
09
Bit[1]
Bit[1]
(Hex)
DLL
0C
C0
01
02
03
06
30
60
80
00
00
Bit[0]
Bit[0]
Rev. 1.6