Samsung S3F80JB Manuel D’Utilisation

13-1 

The S3F80JB microcontroller has a 16-bit timer/counter called Timer 2 (T2). For universal remote controller 
applications, timer 2 can be used to generate the envelope pattern for the remote controller signal. Timer 2 has 
the following components: 

—  One control register, T2CON (E8H, Set 1, Bank1, R/W) 

—  Two 8-bit counter registers, T2CNTH and T2CNTL (E4H and E5H, Set1, Bank1, Read only) 

—  Two 8-bit reference data registers, T2DATAH and T2DATAL (E6H and E7H, Set 1, Bank1, R/W) 

— One 

16-bit 

comparator 

You can select one of the following clock sources as the timer 2 clock: 

— Oscillator 

frequency 

(f

OSC

) divided by 4, 8, or 16 

—  Internal clock input from the counter A module (counter A flip/flop output) 

You can use Timer 2 in three ways:  

—  As a normal free run counter, generating a timer 2 overflow interrupt (IRQ3, vector F0H) at programmed time 

intervals.  

—  To generate a timer 2 match interrupt (IRQ3, vector F2H) when the 16-bit timer 2 count value matches the 

16-bit value written to the reference data registers.  

—  To generate a timer 2 capture interrupt (IRQ3, vector F2H) when a triggering condition exists at the P3.2 pin 

for 44 package; at the P3.0 for 32 package (You can select a rising edge, a falling edge, or both edges as the 
trigger).  

In the S3F80JB interrupt structure, the timer 2 overflow interrupt has higher priority than the timer 2 match or 
capture interrupt.  

The CPU clock should be faster than timer 2 clock.