ox16pci958 Oxford Electrical Products, ox16pci958 Datasheet - Page 18

• Manufacturer Part Number: ox16pci958
• Description: Octal Uart With Interface
• Manufacturer: Oxford Electrical Products

OXFORD SEMICONDUCTOR LTD.
Table 14 shows how to select the required UART register.
X = irrelevant, 0 = low level, 1 = high level
The system programmer, using the host, can access any of the UART registers, as summarized in
Table 15.
DS-0022 Nov 05
IRSR
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
>17
DLAB
0
0
1
1
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
A2:0
0
0
0
1
1
2
2
3
4
5
6
6
8
9
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
Mnemonic
RBR
THR
DLL
DLM
IER
IIR
FCR
LCR
MCR
LSR
MSR
IRSR
PCR
SCC
SCR
ISCR
CIDR
SFR
-
-
UCR
-
RFLR
TFLR
-
-
-
RFTR
RITR
TITR
CPR
WER
-
Table 14 Register Selection
External—Free Release
Register
Receiver buffer register (read only)
Transmitter holding register (write only)
LSB divisor latch
MSB divisor latch
Interrupt enable register
Interrupt identification register (read only)
FIFO control register (write only)
Line control register
Modem control register
Line status register (read only)
Modem status register (read only)
Indexed register select register (write only)
Port-control: alternate control for CPR
Safety-catch control
Scratch pad register
Inverted scratch pad register
Chip ID register (read only)
Synchronisation factor register
Reserved for compatibility
Reserved for compatibility
UART configuration register
Reserved for compatibility
Receive FIFO level register
Transmit FIFO level register
Reserved for compatibility
Reserved for compatibility
Reserved for compatibility
Receive FIFO flow-control trigger register
Receive FIFO interrupt trigger register
Transmit FIFO interrupt trigger register
Clock prescaler register
Wake event enable register
Reserved for future use – do not read or write
OX16PCI958 DATA SHEET
Page 18