mcs7720 MosChip, mcs7720 Datasheet - Page 7

• Manufacturer Part Number: mcs7720
• Description: Usb-1.1 To Dual Serial Ports
• Manufacturer: MosChip

Rev. 1.1
UART Register Set:
The UART has 10 registers. Mapping is dependent on the Line Control Register (LCR).
Register:
Description:
Offset:
Permissions:
Access Condition:
Register:
Description:
Offset:
Permissions:
Access Condition:
Register
Name
MCR
MSR
THR
RHR
FCR
SPR
DLM
LCR
LSR
DLL
IER
ISR
Offset R/W Bit[7] Bit[6]
Bit[7]
Bit[7]
0
0
1
2
2
3
4
5
6
7
0
1
Additional Standard Registers - these are accessed when LCR[7] = 1
R/W
R/W DLE
R/W
R/W
R/W
R/W
W
W
R
R
R
R
THR
Data to be transmitted
0
Write
LCR[7] =0, only write condition can access this register
RHR
Data to be received
0
Read
LCR[7] =0, only read condition can access this register
Bit[6]
Bit[6]
Error
Trigger Level
Data
DCD
Reserved
Enabled
FIFOs
RHR
Empty
Break
Reserved
Tx
Tx
RI
Bit[5]
Bit[5]
Data to be transmitted (Transmitting Holding Register)
Data to be received (Receiver Holding Register)
RTS/CTS
Control
Empty
Bit[5]
Force
Parity
Flow
DSR
THR
Reserved
Reserved
Data to be transmitted
Data to be received
Bit[4]
Bit[4]
Odd/Even
Divisor Latch bits[15:8]
Divisor Latch bits[7:0]
Scratch Pad Register
Break
Bit[4]
Sleep
Mode
Parity
Loop
CTS
Rx
Bit[3]
Bit[3]
Reserved
Interrupt
Framing
Modem
Enable
Bit[3]
Parity
Mask
Delta
Error
DCD
USB-1.1 to Dual Serial Ports
Unused
Interrupt Priority
Bit[2]
Bit[2]
Interrupt
Rx Stat
Bit[2]
Parity
Mask
Flush
TERI
Error
THR
Stop
MCS7720
Bits
Interrupt
Overrun RxRdy
THRE
Bit[1]
Bit[1]
Bit[1]
Flush
Mask
Delta
RHR
DSR
RTS
Data Length
Interrupt
Interrupt
Pending
Enable
RxRdy
Bit[0]
Mask
Delta
FIFO
DTR
CTS
Bit[0]
Bit[0]
Page 7