Cirrus Logic EP93xx - Manual (Page 11)

DS785UM1
©
Copyright 2007 Cirrus Logic, Inc. xi
EP93xx User’s Guide
Chapter 17. IrDA .................................................................................................. 17-1
17.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-1
17.2 IrDA Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-1
17.3 Shared IrDA Interface Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-2
17.3.1 Overview......................................................................................................................17-2
17.3.2 Functional Description .................................................................................................17-2
17.3.2.1 General Configuration................................................................................17-3
17.3.2.2 Transmitting Data ......................................................................................17-3
17.3.2.3 Receiving Data ..........................................................................................17-5
17.3.2.4 Special Conditions .....................................................................................17-7
17.3.3 Control Information Buffering.......................................................................................17-8
17.4 Medium IrDA Specific Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-8
17.4.1 Introduction..................................................................................................................17-8
17.4.1.1 Bit Encoding...............................................................................................17-8
17.4.1.2 Frame Format ............................................................................................17-9
17.4.2 Functional Description ...............................................................................................17-11
17.4.2.1 Baud Rate Generation .............................................................................17-11
17.4.2.2 Receive Operation ...................................................................................17-11
17.4.2.3 Transmit Operation ..................................................................................17-13
17.5 Fast IrDA Specific Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-13
17.5.1 Introduction................................................................................................................17-14
17.5.1.1 4PPM Modulation ....................................................................................17-14
17.5.1.2 4.0 Mbps FIR Frame Format ...................................................................17-15
17.5.2 Functional Description ...............................................................................................17-17
17.5.2.1 Baud Rate Generation .............................................................................17-17
17.5.2.2 Receive Operation ...................................................................................17-18
17.5.2.3 Transmit Operation ..................................................................................17-19
17.5.3 IrDA Connectivity.......................................................................................................17-20
17.5.4 IrDA Integration Information ......................................................................................17-21
17.5.4.1 Enabling Infrared Modes..........................................................................17-21
17.5.4.2 Clocking Requirements............................................................................17-21
17.5.4.3 Bus Bandwidth Requirements .................................................................17-22
17.6 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-23
Chapter 18. Timers .............................................................................................. 18-1
18.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-1
18.1.1 Features ......................................................................................................................18-1
18.1.2 16 and 32-bit Timer Operation.....................................................................................18-1
18.1.2.1 Free Running Mode ...................................................................................18-2
18.1.2.2 Pre-load Mode ...........................................................................................18-2
18.1.3 40-bit Timer Operation.................................................................................................18-2
18.2 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-2
Chapter 19. Watchdog Timer.............................................................................. 19-1
19.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-1
19.1.1 Watchdog Activation....................................................................................................19-2
19.1.2 Clocking Requirements ...............................................................................................19-2
19.1.3 Reset Requirements....................................................................................................19-2
19.1.4 Watchdog Status .........................................................................................................19-2
19.1 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-3