Key Features Of System Timer; Internal Function Of System Timer - Samsung S5PC110 Manual

S5PC110_UM

2.2 KEY FEATURES OF SYSTEM TIMER

• Clock sources of ST such as, main OSC (XXTI), RTC OSC (XrtcXTI), USB OSC (XusbXTI), and PCLK
• Counter bit: 32-bit like PWM timer
• Changeable interrupt-interval without stopping reference tick
• Used in all power modes except sleep mode.
• Tick generation: fractional divider for 1ms tick generation with RTC clock frequency (32.768 kHz)

2.3 INTERNAL FUNCTION OF SYSTEM TIMER

There are two separate system timers in S5PC110. The first timer is used for tick generation, while the other is
used for interrupt generation. Two independent SFR sets and logic blocks are used for tick and interrupt region.
Each logic block operates separately. Therefore, you can change interrupt interval independent to reference tick
generation. This is very useful feature for some power-saving modes.
Figure 2-2 Two Separate Timers
2 SYSTEM TIMER
2-2