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CONTENTS
8.4 PROGRAMMING THE INTERRUPT CONTROL UNIT............................................... 8-11
8.4.1 Interrupt Control Registers ......................................................................................8-12
8.4.2 Interrupt Request Register ......................................................................................8-16
8.4.3 Interrupt Mask Register ...........................................................................................8-16
8.4.4 Priority Mask Register .............................................................................................8-17
8.4.5 In-Service Register .................................................................................................8-18
8.4.6 Poll and Poll Status Registers .................................................................................8-19
8.4.7 End-of-Interrupt (EOI) Register ...............................................................................8-21
8.4.8 Interrupt Status Register .........................................................................................8-22
8.5 SLAVE MODE ............................................................................................................. 8-23
8.5.1 Slave Mode Programming ......................................................................................8-25
8.5.1.1 Interrupt Vector Register ...............................................................................8-26
8.5.1.2 End-Of-Interrupt Register ..............................................................................8-27
8.5.1.3 Other Registers .............................................................................................8-28
8.5.2 Interrupt Vectoring in Slave Mode ...........................................................................8-29
8.5.3 Initializing the Interrupt Control Unit for Master Mode .............................................8-30
CHAPTER 9
TIMER/COUNTER UNIT
9.1 FUNCTIONAL OVERVIEW............................................................................................ 9-1
9.2 PROGRAMMING THE TIMER/COUNTER UNIT .......................................................... 9-6
9.2.1 Initialization Sequence ............................................................................................9-11
9.2.2 Clock Sources .........................................................................................................9-12
9.2.3 Counting Modes ......................................................................................................9-12
9.2.3.1 Retriggering ...................................................................................................9-13
9.2.4 Pulsed and Variable Duty Cycle Output ..................................................................9-14
9.2.5 Enabling/Disabling Counters ...................................................................................9-15
9.2.6 Timer Interrupts .......................................................................................................9-16
9.2.7 Programming Considerations ..................................................................................9-16
9.3 TIMING ........................................................................................................................ 9-16
9.3.1 Input Setup and Hold Timings .................................................................................9-16
9.3.2 Synchronization and Maximum Frequency .............................................................9-17
9.3.2.1 Timer/Counter Unit Application Examples .....................................................9-17
9.3.3 Real-Time Clock .....................................................................................................9-17
9.3.4 Square-Wave Generator .........................................................................................9-17
9.3.5 Digital One-Shot ......................................................................................................9-17
CHAPTER 10
DIRECT MEMORY ACCESS UNIT
10.1 FUNCTIONAL OVERVIEW.......................................................................................... 10-1
10.1.1 The DMA Transfer ..................................................................................................10-1
10.1.1.1 DMA Transfer Directions ...............................................................................10-3
10.1.1.2 Byte and Word Transfers ..............................................................................10-3
10.1.2 Source and Destination Pointers ............................................................................10-3