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7.5.2
7.5.3
7.6
7.6.1
7.6.2
7.6.3
7.6.4
7.7
7.7.1
7.7.2
7.8
7.8.1
7.8.2
7.9
7.9.1
7.9.2
7.9.3
7.9.4
7.10
7.10.1
7.10.2
7.10.3
7.10.4
7.10.5
7.11
7.11.1
7.11.2
7.11.3
7.11.4
7.11.5
7.11.6
7.11.7
7.11.8
7.11.9
7.11.10
7.11.11
7.11.12
8
8.1
8.2
8.3
9
9.1
9.1.1
9.1.2
9.1.3
9.1.4
9.2
9.3
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
Data Sheet Revision 1.3
Page 3
OX16PCI954
OXFORD SEMICONDUCTOR LTD.
LINE CONTROL REGISTER ‘LCR’........................................................................................................................36
LINE STATUS REGISTER ‘LSR’............................................................................................................................37
INTERRUPTS & SLEEP MODE.................................................................................................................................38
INTERRUPT ENABLE REGISTER ‘IER’.................................................................................................................38
INTERRUPT STATUS REGISTER ‘ISR’.................................................................................................................39
INTERRUPT DESCRIPTION..................................................................................................................................39
SLEEP MODE.......................................................................................................................................................40
MODEMINTERFACE................................................................................................................................................40
MODEMCONTROL REGISTER ‘MCR’..................................................................................................................40
MODEMSTATUS REGISTER ‘MSR’.....................................................................................................................41
OTHER STANDARD REGISTERS.............................................................................................................................41
DIVISOR LATCH REGISTERS ‘DLL & DLM..........................................................................................................41
SCRATCH PAD REGISTER ‘SPR’.........................................................................................................................41
AUTOMATIC FLOW CONTROL................................................................................................................................42
ENHANCED FEATURES REGISTER ‘EFR’...........................................................................................................42
SPECIAL CHARACTER DETECTION....................................................................................................................43
AUTOMATIC IN-BAND FLOW CONTROL..............................................................................................................43
AUTOMATIC OUT-OF-BAND FLOW CONTROL....................................................................................................43
BAUD RATE GENERATION......................................................................................................................................44
GENERAL OPERATION........................................................................................................................................44
CLOCK PRESCALER REGISTER ‘CPR’................................................................................................................44
TIMES CLOCK REGISTER ‘TCR’..........................................................................................................................44
EXTERNAL 1X CLOCK MODE..............................................................................................................................46
CRYSTAL OSCILLATOR CIRCUIT........................................................................................................................46
ADDITIONAL FEATURES.........................................................................................................................................46
ADDITIONAL STATUS REGISTER ‘ASR’...............................................................................................................46
FIFO FILL LEVELS ‘TFL & RFL’.............................................................................................................................47
ADDITIONAL CONTROL REGISTER ‘ACR’...........................................................................................................47
TRANSMITTER TRIGGER LEVEL ‘TTL’ ................................................................................................................48
RECEIVER INTERRUPT. TRIGGER LEVEL ‘RTL’ .................................................................................................48
FLOW CONTROL LEVELS ‘FCL’ & ‘FCH’..............................................................................................................48
DEVICE IDENTIFICATION REGISTERS................................................................................................................48
CLOCK SELECT REGISTER ‘CKS’ .......................................................................................................................49
NINE-BIT MODE REGISTER ‘NMR’.......................................................................................................................49
MODEMDISABLE MASK ‘MDM............................................................................................................................50
READABLE FCR ‘RFC’..........................................................................................................................................50
GOOD-DATA STATUS REGISTER ‘GDS’..............................................................................................................50
LOCAL BUS...............................................................................................................................................51
OVERVIEW...............................................................................................................................................................51
OPERATION.............................................................................................................................................................51
CONFIGURATION & PROGRAMMING......................................................................................................................52
BIDIRECTIONAL PARALLEL PORT.......................................................................................................53
OPERATION AND MODE SELECTION.....................................................................................................................53
SPP MODE ...........................................................................................................................................................53
PS2 MODE............................................................................................................................................................53
EPP MODE ...........................................................................................................................................................53
ECP MODE (NOT SUPPORTED)..........................................................................................................................53
PARALLEL PORT INTERRUPT................................................................................................................................53
REGISTER DESCRIPTION........................................................................................................................................54
PARALLEL PORT DATA REGISTER ‘PDR’ ...........................................................................................................54
DEVICE STATUS REGISTER ‘DSR’......................................................................................................................54
DEVICE CONTROL REGISTER ‘DCR’...................................................................................................................55
EPP ADDRESS REGISTER ‘EPPA’.......................................................................................................................55
EPP DATA REGISTERS ‘EPPD1-4’.......................................................................................................................55
EXTENDED CONTROL REGISTER ‘ECR’.............................................................................................................55