Intel 8XC196NT User Manual page 7

8XC196NT USER'S MANUAL
CHAPTER 5
STANDARD AND PTS INTERRUPTS
5.1 OVERVIEW OF INTERRUPTS...................................................................................... 5-1
5.2 INTERRUPT SIGNALS AND REGISTERS ................................................................... 5-3
5.3 INTERRUPT SOURCES AND PRIORITIES.................................................................. 5-4
5.3.1 Special Interrupts ......................................................................................................5-6
5.3.1.1 Unimplemented Opcode ......................................................................................5-6
5.3.1.2 Software Trap .......................................................................................................5-6
5.3.1.3 NMI .......................................................................................................................5-6
5.3.2 External Interrupt Pins ..............................................................................................5-6
5.3.3 Multiplexed Interrupt Sources ...................................................................................5-7
5.3.4 End-of-PTS Interrupts ...............................................................................................5-7
5.4 INTERRUPT LATENCY................................................................................................. 5-7
5.4.1 Situations that Increase Interrupt Latency ................................................................5-8
5.4.2 Calculating Latency ...................................................................................................5-8
5.4.2.1 Standard Interrupt Latency ...................................................................................5-9
5.4.2.2 PTS Interrupt Latency ..........................................................................................5-9
5.5 PROGRAMMING THE INTERRUPTS......................................................................... 5-10
5.5.1 Programming the Multiplexed Interrupts .................................................................5-11
5.5.2 Modifying Interrupt Priorities ...................................................................................5-14
5.5.3 Determining the Source of an Interrupt ...................................................................5-16
5.5.3.1 Determining the Source of Multiplexed Interrupts ..............................................5-16
5.6 INITIALIZING THE PTS CONTROL BLOCKS............................................................. 5-18
5.6.1 Specifying the PTS Count .......................................................................................5-19
5.6.2 Selecting the PTS Mode .........................................................................................5-20
5.6.3 Single Transfer Mode ..............................................................................................5-21
5.6.4 Block Transfer Mode ...............................................................................................5-24
5.6.5 A/D Scan Mode .......................................................................................................5-26
5.6.5.1 A/D Scan Mode Cycles ......................................................................................5-29
5.6.5.2 A/D Scan Mode Example 1 ................................................................................5-29
5.6.5.3 A/D Scan Mode Example 2 ................................................................................5-30
5.6.6 PWM Modes ...........................................................................................................5-31
5.6.6.1 PWM Toggle Mode Example .............................................................................5-33
5.6.6.2 PWM Remap Mode Example .............................................................................5-37
CHAPTER 6
I/O PORTS
6.1 I/O PORTS OVERVIEW ................................................................................................ 6-1
6.2 INPUT-ONLY PORT 0 ................................................................................................... 6-1
6.2.1 Standard Input-only Port Operation ..........................................................................6-2
6.2.2 Standard Input-only Port Considerations ..................................................................6-3
6.3 BIDIRECTIONAL PORTS 1, 2, 5, AND 6 ...................................................................... 6-3
6.3.1 Bidirectional Port Operation ......................................................................................6-5
6.3.2 Bidirectional Port Pin Configurations .........................................................................6-9
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