OX16C950 rev B
OXFORD SEMICONDUCTOR LTD.
CONTENTS
FEATURES....................................................................................................................................................................................... 1
REV B ENHANCEMENTS................................................................................................................................................................ 1
DESCRIPTION ................................................................................................................................................................................. 2
CONTENTS ...................................................................................................................................................................................... 3
1
2
3
PERFORMANCE COMPARISON.............................................................................................................................................. 5
BLOCK DIAGRAM..................................................................................................................................................................... 6
PIN INFORMATION.................................................................................................................................................................... 7
4
4.1
PIN DESCRIPTIONS.................................................................................................................................................................. 8
FURTHER PIN INFORMATION ................................................................................................................................................. 11
5
MODE SELECTION.................................................................................................................................................................. 13
450 MODE........................................................................................................................................................................... 13
550 MODE........................................................................................................................................................................... 13
EXTENDED 550 MODE.......................................................................................................................................................... 13
750 MODE........................................................................................................................................................................... 13
650 MODE........................................................................................................................................................................... 13
950 MODE........................................................................................................................................................................... 14
5.1
5.2
5.3
5.4
5.5
5.6
6
REGISTER DESCRIPTION TABLES....................................................................................................................................... 15
7
7.1
7.2
RESET CONFIGURATION....................................................................................................................................................... 19
HARDWARE RESET............................................................................................................................................................... 19
SOFTWARE RESET ............................................................................................................................................................... 19
8
TRANSMITTER & RECEIVER FIFOS...................................................................................................................................... 20
8.1
FIFO CONTROL REGISTER ‘FCR’ ......................................................................................................................................... 20
9
LINE CONTROL & STATUS.................................................................................................................................................... 21
FALSE START BIT DETECTION............................................................................................................................................... 21
LINE CONTROL REGISTER ‘LCR’........................................................................................................................................... 21
LINE STATUS REGISTER ‘LSR’.............................................................................................................................................. 22
9.1
9.2
9.3
10 INTERRUPTS & SLEEP MODE............................................................................................................................................... 23
10.1 INTERRUPT ENABLE REGISTER ‘IER’..................................................................................................................................... 23
10.2 INTERRUPT STATUS REGISTER ‘ISR’..................................................................................................................................... 24
10.3 INTERRUPT DESCRIPTION ..................................................................................................................................................... 24
10.4 SLEEP MODE ....................................................................................................................................................................... 25
11 MODEM INTERFACE............................................................................................................................................................... 25
11.1 MODEM CONTROL REGISTER ‘MCR’ ..................................................................................................................................... 25
11.2 MODEM STATUS REGISTER ‘MSR’ ........................................................................................................................................ 26
12 OTHER STANDARD REGISTERS .......................................................................................................................................... 27
12.1 DIVISOR LATCH REGISTERS ‘DLL & DLM’............................................................................................................................. 27
12.2 SCRATCH PAD REGISTER ‘SPR’ ........................................................................................................................................... 27
13 AUTOMATIC FLOW CONTROL.............................................................................................................................................. 28
13.1 ENHANCED FEATURES REGISTER ‘EFR’................................................................................................................................ 28
13.2 SPECIAL CHARACTER DETECTION......................................................................................................................................... 29
13.3 AUTOMATIC IN-BAND FLOW CONTROL ................................................................................................................................... 29
13.4 AUTOMATIC OUT-OF-BAND FLOW CONTROL........................................................................................................................... 29
14 BAUD RATE GENERATION.................................................................................................................................................... 30
14.1 GENERAL OPERATION .......................................................................................................................................................... 30
14.2 CLOCK PRESCALER REGISTER ‘CPR’.................................................................................................................................... 31
14.3 TIMES CLOCK REGISTER ‘TCR’............................................................................................................................................. 31
14.4 INPUT CLOCK OPTIONS ........................................................................................................................................................ 33
14.5 TTL CLOCK MODULE ........................................................................................................................................................... 33
Data Sheet Revision 1.2
Page 3
OXFORD [ OXFORD SEMICONDUCTOR ]
