mcs7840 MosChip, mcs7840 Datasheet - Page 30

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

Page 30
MCS7840
USB-2.0 to Four Serial Ports
Device Confi guration Bit Fields and Descriptions
Bytes 4, 5, 6 and 22-30 form twenty-four 8-bit DCR Registers. These Bytes are read from the EEPROM, and
loaded into the Global Device Confi guration Registers after Power-On Reset. They can be programmed by
software using the following application number and register indexes as shown in the table.
The following tables describe the function of each bit in the DCR registers. There are three DCR registers
for each Serial Port (IrDA). In the absence of an EEPROM, the default values are taken from the Device
Confi guration Registers.
EEPROM
Location
10
11
12
13
14
15
16
17
18
19
8
9
SER1_DCR[23:16]
SER2_DCR[23:16]
SER3_DCR[23:16]
SER4_DCR[23:16]
SER1_DCR[15:8]
SER2_DCR[15:8]
SER3_DCR[15:8]
SER4_DCR[15:8]
SER1_DCR[7:0]
SER2_DCR[7:0]
SER3_DCR[7:0]
SER4_DCR[7:0]
DCR Bit
SER1_DCR0
SER1_DCR1
SER1_DCR2
SER2_DCR0
SER2_DCR1
SER2_DCR2
SER3_DCR0
SER3_DCR1
SER3_DCR2
SER4_DCR0
SER4_DCR1
SER4_DCR2
DCR Name
Application
Number
0
0
0
0
0
0
0
0
0
0
0
0
Register
Index
22
23
24
25
26
27
28
29
30
4
5
6
Default
Value
0x01
0x85
0x24
0x01
0x84
0x24
0x01
0x84
0x24
0x01
0x84
0x24
Rev.
1.2