Samsung S3F80JB, User Manual

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S3F80JB TIMER 1
11-1
11
TIMER 1
OVERVIEW
The S3F80JB microcontroller has a 16-bit timer/counter called Timer 1 (T1). For universal remote controller
applications, Timer 1 can be used to generate the envelope pattern for the remote controller signal. Timer 1 has
the following components:
— One control register, T1CON (FAH, Set 1, Bank0, R/W)
— Two 8-bit counter registers, T1CNTH and T1CNTL (F6H and F7H, Set 1, Bank0, Read-only)
— Two 8-bit reference data registers, T1DATAH and T1DATAL (F8H and F9H, Set 1, Bank0, R/W)
— One 16-bit comparator
You can select one of the following clock sources as the Timer 1 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 1 in three ways:
— As a normal free run counter, generating a Timer 1 overflow interrupt (IRQ1, vector F4H) at programmed time
intervals.
— To generate a Timer 1 match interrupt (IRQ1, vector F6H) when the 16-bit Timer 1 count value matches the
16-bit value written to the reference data registers.
— To generate a Timer 1 capture interrupt (IRQ1, vector F6H) 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 1 overflow interrupt has higher priority than the Timer 1 match or
capture interrupt.
NOTE
The CPU clock should be faster than timer 1 clock.