Intel 8XC196NP, 80C196NU, Microcontroller manual Chapter Ports

8XC196NP, 80C196NU USER’S MANUAL
CHAPTER 6
STANDARD AND PTS INTERRUPTS
6.1	OVERVIEW OF INTERRUPTS		6-1
6.2	INTERRUPT SIGNALS AND REGISTERS		6-3
6.3	INTERRUPT SOURCES AND PRIORITIES		6-4
6.3.1		Special Interrupts	6-4
6.3.1.1		Unimplemented Opcode	6-5
6.3.1.2		Software Trap	6-5
6.3.1.3		NMI	6-6
6.3.2		External Interrupt Pins	6-6
6.3.3		Multiplexed Interrupt Sources	6-6
6.3.4		End-of-PTS Interrupts	6-6
6.4	INTERRUPT LATENCY		6-7
6.4.1 Situations that Increase Interrupt Latency			6-7
6.4.2		Calculating Latency	6-8
6.4.2.1		Standard Interrupt Latency	6-8
6.4.2.2		PTS Interrupt Latency	6-9
6.5	PROGRAMMING THE INTERRUPTS		6-10
6.5.1 Programming Considerations for Multiplexed Interrupts			6-11
6.5.2		Modifying Interrupt Priorities	6-13
6.5.3 Determining the Source of an Interrupt			6-15
6.6	INITIALIZING THE PTS CONTROL BLOCKS		6-17
6.6.1		Specifying the PTS Count	6-18
6.6.2		Selecting the PTS Mode	6-19
6.6.3		Single Transfer Mode	6-20
6.6.4		Block Transfer Mode	6-23
6.6.5		PWM Modes	6-26
6.6.5.1 PWM Toggle Mode Example			6-27
6.6.5.2		PWM Remap Mode Example	6-32
CHAPTER 7
I/O PORTS
7.1	I/O PORTS OVERVIEW		7-1
7.2	BIDIRECTIONAL PORTS 1–4		7-1
7.2.1		Bidirectional Port Operation	7-3
7.2.2 Bidirectional Port Pin Configurations			7-7
7.2.3 Bidirectional Port Pin Configuration Example			7-8
7.2.4		Bidirectional Port Considerations	7-9
7.2.5 Design Considerations for External Interrupt Inputs			7-11
7.3	EPORT		7-11
7.3.1		EPORT Operation	7-12
7.3.1.1		Reset	7-14
7.3.1.2		Output Enable	7-14
7.3.1.3		Complementary Output Mode	7-14

vi