Samsung S3F80JB Timer 2 Match Interrupt, Simplified Timer 2 Function Diagram Interval Timer Mode

S3F80JB TIMER 2

TIMER 2 MATCH INTERRUPT

Timer 2 can also be used to generate a match interrupt (IRQ3, vector F2H) whenever the 16-bit counter value matches the value that is written to the timer 2 reference data registers, T2DATAH and T2DATAL. When a match condition is detected by the 16-bit comparator, the match interrupt is generated, the counter value is cleared, and up counting resumes from ‘00H’.

In match mode, program software can poll the timer 2 match/capture interrupt pending bit, T2CON.0, to detect when a timer 2 match interrupt pending condition exists (T2CON.0 = “1”). When the interrupt request is acknowledged by the CPU and the service routine starts, the interrupt service routine for vector F2H must clear the interrupt pending condition by writing a “0” to T2CON.0.

			IRQ3 (T2INT)
				Pending
			(T2CON.0)
	Interrupt
	Enable/Disable
	(T2CON.1)	R (Clear)
CLK	16-Bit Up Counter
		Match
	16-Bit Comparator					CTL
	Timer 2 High/Low				T2CON.5
	Buffer Register				T2CON.4
					Match Signal
					T2CON.3
	Timer 2 Data High/Low
	Buffer Register

P3.0 or P3.3

Figure 13-2. Simplified Timer 2 Function Diagram: Interval Timer Mode

13-3