Intel 8XC251SQ, 8XC251SA, 8XC251SP, 8XC251SB manual Chapter TIMER/COUNTERS and Watchdog Timer

			CONTENTS
5.4	BIT INSTRUCTIONS		5-11
5.4.1		Bit Addressing	5-11
5.5	CONTROL INSTRUCTIONS		5-12
5.5.1 Addressing Modes for Control Instructions			5-13
5.5.2		Conditional Jumps	5-14
5.5.3		Unconditional Jumps	5-15
5.5.4		Calls and Returns	5-15
5.6	PROGRAM STATUS WORDS		5-16
CHAPTER 6
INTERRUPT SYSTEM
6.1	OVERVIEW		6-1
6.2	8XC251SA, SB, SP, SQ INTERRUPT SOURCES		6-3
6.2.1		External Interrupts	6-3
6.2.2		Timer Interrupts	6-4
6.3	PROGRAMMABLE COUNTER ARRAY (PCA) INTERRUPT		6-5
6.4	SERIAL PORT INTERRUPT		6-5
6.5	INTERRUPT ENABLE		6-5
6.6	INTERRUPT PRIORITIES		6-7
6.7	INTERRUPT PROCESSING		6-9
6.7.1 Minimum Fixed Interrupt Time			6-10
6.7.2		Variable Interrupt Parameters	6-10
6.7.2.1		Response Time Variables	6-10
6.7.2.2 Computation of Worst-case Latency With Variables			6-12
6.7.2.3		Latency Calculations	6-13
6.7.2.4		Blocking Conditions	6-14
6.7.2.5		Interrupt Vector Cycle	6-14
6.7.3		ISRs in Process	6-15
CHAPTER 7
INPUT/OUTPUT PORTS
7.1	INPUT/OUTPUT PORT OVERVIEW		7-1
7.2	I/O CONFIGURATIONS		7-2
7.3	PORT 1 AND PORT 3		7-2
7.4	PORT 0 AND PORT 2		7-2
7.5	READ-MODIFY-WRITE INSTRUCTIONS		7-5
7.6	QUASI-BIDIRECTIONAL PORT OPERATION		7-6
7.7	PORT LOADING		7-7
7.8	EXTERNAL MEMORY ACCESS		7-7
CHAPTER 8
TIMER/COUNTERS AND WATCHDOG TIMER
8.1	TIMER/COUNTER OVERVIEW		8-1

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