ox16pci954 ETC-unknow, ox16pci954 Datasheet - Page 41

• Manufacturer Part Number: ox16pci954
• Description: Integrated Quad Uart Interface
• Manufacturer: ETC-unknow

750 (normal) mode:
logic 0
logic 1
In non-enhanced mode, this bit enables the CTS/RTS out-
of-band flow control.
MCR[6]: IrDA mode
logic 0
logic 1
This function is only available in Enhanced mode. It
requires a 16x clock to function correctly.
MCR[7]: Baud rate prescaler select
logic 0
logic 1
where M & N are programmed in CPR (ICR offset 0x01).
After a hardware reset, CPR defaults to 0x20 (divide-by-4)
and MCR[7] is reset. User writes to this flag will only take
effect in Enhanced mode. See section 7.9.1.
7.8
7.8.1
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 by in order to generate serial
baud rates. After a hardware reset, the baud rate used by
the transmitter and receiver is given by:
Where divisor is given by DLL + ( 256 x DLM ). More
flexible baud rate generation options are also available.
See section 7.10 for full details.
Data Sheet Revision 1.3
OXFORD SEMICONDUCTOR LTD.
Other Standard Registers
Divisor Latch Registers ‘DLL & DLM’
CTS/RTS flow control disabled.
CTS/RTS flow control enabled.
Standard serial receiver and transmitter data
format.
Data will be transmitted and received in IrDA
format.
Normal (divide by 1) baud rate generator
prescaler selected.
Divide-by-“M+N/8”
prescaler selected.
Baudrate
16
InputClock
*
baud
Divisor
rate
generator
7.7.2
MSR[0]: Delta CTS#
Indicates that the CTS# input has changed since the last
time the MSR was read.
MSR[1]: Delta DSR#
Indicates that the DSR# input has changed since the last
time the MSR was read.
MSR[2]: Trailing edge RI#
Indicates that the RI# input has changed from low to high
since the last time the MSR was read.
MSR[3]: Delta DCD#
Indicates that the DCD# input has changed since the last
time the MSR was read.
MSR[4]: CTS
This bit is the complement of the CTS# input. It is
equivalent to RTS (MCR[1]) in internal loop-back mode.
MSR[5]: DSR
This bit is the complement of the DSR# input. It is
equivalent to DTR (MCR[0]) in internal loop-back mode.
MSR[6]: RI
This bit is the complement of the RI# input. In internal loop-
back mode it is equivalent to the internal OUT1.
MSR[7]: DCD
This bit is the complement of the DCD# input. In internal
loop-back mode it is equivalent to the internal OUT2.
7.8.2
The scratch pad register does not affect operation of the
rest of the UART in any way and can be used for
temporary data storage. The register may also be used to
define an offset value to access the registers in the
Indexed Control Register set. For more information on
Indexed Control registers see sections 7.2 and 7.11.
Modem Status Register ‘MSR’
Scratch Pad Register ‘SPR’
OX16PCI954
Page 41