OX16C950 rev B
OXFORD SEMICONDUCTOR LTD.
Register
Name
SPR
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Offset 10
Indexed Control Register Set
ACR
0x00
R/W
Addit-
ional
Status
Enable
ICR
Read
Enable
950
Trigger
Level
DTR definition and
control
Auto
DSR
Flow
Control
Enable
Tx
Disable
Rx
Disable
Enable
CPR
TCR
CKS
TTL
0x01
0x02
0x03
0x04
0x05
R/W
R/W
R/W
R/W
R/W
5 Bit “integer” part of
clock prescaler
Unused
3 Bit “fractional” part of
clock prescaler
4 Bit N-times clock
selection bits [3:0]
Tx 1x
Mode
Unused
Tx CLK
Select
BDOUT
on DTR
DTR 1x
Tx CLK
Rx 1x
Mode
Disable
BDOUT
Receiver
Clock Sel[1:0]
Transmitter Interrupt Trigger Level (0-127)
RTL
Unused
Unused
Unused
Receiver Interrupt Trigger Level (1-127)
FCL
0x06
R/W
Automatic Flow Control Lower Trigger Level (0-127)
FCH
ID1
ID2
ID3
0x07
0x08
0x09
0x0A
R/W
R
Automatic Flow Control Higher Trigger level (1-127)
Hardwired ID byte 1 (0x16)
R
Hardwired ID byte 1 (0xC9)
R
Hardwired ID byte 1 (0x50)
REV
0x0B
R
Hardwired revision byte (0x03)
CSR
NMR
MDM
0x0C
0x0D
0x0E
W
Writing 0x00 to this register will
reset the UART (Except the CKS and CKA registers)
R/W
R/W
Unused
9th Bit
9th Bit
Schar 3
9th Bit
SChar 2
∆ DCD
Wakeup
disable
FCR[3]
9th Bit
SChar 1
Trailing
RI edge
disable
9th-bit Int.
En.
∆ DSR
Wakeup
disable
FCR[1]
9 Bit
Enable
SChar 4
∆ CTS
Wakeup
disable
FCR[0]
Good
Unused
RFC
GDS
0X0F
0X10
R
R
FCR[7]
FCR[6]
FCR[5]
FCR[4]
Unused
FCR[2]
Data
Status
RxRdy
status
( R )
DMS
0x11
R/W
Force
TxRdy
inactive
Force
RxRdy
inactive
TxRdy
status
( R )
Unused
Hardwired Port Index ( 0x00 )
PIDX
CKA
0x12
0x13
R
R/W
Unused
Output
sys-clk
on txrdy
Use
CLKSEL
pin for
Invert
DTR
signal
Invert
internal
tx clock
Invert
internal
rx clock
sys-clk
Table 7: Indexed Control Register Set
Note 10: The SPR offset column indicates the value that must be written into SPR prior to reading / writing any of the indexed control registers
via ICR. Offset values not listed in the table are reserved for future use and must not be used.
To read or write to any of the Indexed Control Registers use the following procedure.
Writing to ICR registers:
Ensure that the last value written to LCR was not 0xBF (reserved for 650 compatible register access value).
Write the desired offset to SPR (address 1112).
Data Sheet Revision 1.2
Page 17
OXFORD [ OXFORD SEMICONDUCTOR ]
