Datasheet
5
Intelligent Eight-Channel Communications Controller
—
CD1865
8.9
8.10
8.11
Transmitting Data................................................................................................87
Receiving Data....................................................................................................88
Programming Examples......................................................................................88
8.11.1 Programming the Service Match Registers............................................88
8.11.2 CD1865 Initialization ..............................................................................88
8.11.3 Basic I/O Operations..............................................................................90
8.11.4 Interrupt Response Operations ..............................................................90
8.11.5 Polled Mode Operation...........................................................................93
Detailed Register Descriptions
...........................................................................94
9.1
Register Map Quick Reference...........................................................................94
9.2
Global Registers..................................................................................................97
9.2.1
Miscellaneous Registers ........................................................................98
9.2.2
Configuration Registers..........................................................................98
9.2.3
Service Request/Interrupt Control Registers........................................103
9.3
Indexed Indirect Registers.................................................................................108
9.3.1
Receive Data Count Register...............................................................108
9.3.2
Receive Data Register .........................................................................109
9.3.3
Receive Character Status Register......................................................110
9.3.4
Transmit Data Register ........................................................................111
9.3.5
End-of-Service Request Register.........................................................111
9.4
Channel Registers.............................................................................................111
9.4.1
Enable Register...................................................................................112
9.4.2
Channel Command Register................................................................112
9.4.3
Channel Option Register 1...................................................................116
9.4.4
Channel Option Register 2...................................................................116
9.4.5
Channel Option Register 3...................................................................117
9.4.6
Channel Control Status Register..........................................................118
9.4.7
Receiver Bit Register............................................................................119
9.4.8
Receive Time-Out Period Register.......................................................120
9.4.9
Receive Bit Rate Period Registers (High/Low).....................................120
9.4.10 Transmit Bit Rate Period Registers (High/Low)....................................121
9.4.11 Special Character Register 1 ...............................................................121
9.4.12 Special Character Register 2 ...............................................................122
9.4.13 Special Character Register 3 ...............................................................122
9.4.14 Special Character Register 4 ...............................................................123
9.4.15 Modem Change Register .....................................................................123
9.4.16 Modem Change Option Register 1.......................................................124
9.4.17 Modem Change Option Register 2.......................................................125
9.4.18 Modem Signal Value Register..............................................................125
9.4.19 Modem Signal Value Request-to-Send Register..................................126
9.4.20 Modem Signal Value Data-Terminal-Ready Register ..........................126
Electrical Specifications
....................................................................................127
10.1
Absolute Maximum Ratings...............................................................................127
10.2
Recommended Operating Conditions...............................................................127
10.3
DC Electrical Characteristics.............................................................................127
10.4
Index of Timing Information...............................................................................128
10.5
AC Electrical Characteristics.............................................................................128
10.5.1 Clocked Bus Interface ..........................................................................128
9.0
10.0