S3C2440 bare metal experiment timer

S3c2440 has 5 16-bit timers. Timers 0, 1, 2, and 3 have pulse width modulation (PWM) functions. Timer 4 has an internal timer without an output pin. Timer 0 has a dead zone generator for high-current devices.
 
Timers 0 and 1 share an 8-bit prescaler (prescaler), and timers 2, 3, and 4 share another 8-bit
prescaler .
 
 
The clock source of the timer is PCLK, which first passes through the prescaler to reduce the frequency and then enters the second division. Five different division signals (1/2, 1/4, 1/8, 1/16 and TCLK) can be generated.
 
After the timer is started, TCNTn starts to count down by one. When TCNTn is equal to TCMPn, TOUTn reverses and TCNTn continues to decrement.

When TCNTn= 0, TOUTn reverses again and triggers an interrupt (the interrupt is enabled).
If TCON is set to auto-load, the value of TNCTn/TCMPNn is reloaded.
 
Register:
TCFG0: Configure two 8-bit prescalers, [15:8] These 8 bits determine the prescaler value of timer 2, 3, and 4, [7:0] These 8 bits determine the prescaler value of timer 0 and 1
Output frequency: = PCLK / (prescaler value + 1)
 
TCFG1:
Used to set the second divider. Five different divider signals can be set (1/2, 1/4, 1/8, 1/16 and TCLK).
 
So
the timer operating frequency = PCLK / (prescaler value + 1) / (divider value)
 
divider value = 2,4,8, 16
 
TCON: Timer control register
 
TCNTBn: Set an initial value to be loaded into the down counter.
 
TCMPBn: Sets an initial value to be loaded into the compare register for comparison with the down
counter value.
 
TCNTOn: Reads the value of TCNTBn
 
Timer initialization example:
void timer0_init(void)
{
    TCFG0 = 99; // Prescaler 0 = 99        
    TCFG1 = 0x03; // Select 16-division
    TCNTB0 = 31250; // Trigger an interrupt once every 0.5 seconds
    TCON |= (1<<1); // Manual update

    TCON = 0x09; // Automatically load, clear the "manual update" bit, and start timer 0

}