Contents
3.3.1
32.768 kHz Oscillator............................................................................................3-4
3.3.2
3.6864 MHz Oscillator ..........................................................................................3-4
3.3.3
Core Phase Locked Loop .....................................................................................3-4
3.3.4
3.3.5
147.46 MHz Peripheral Phase Locked Loop ........................................................3-5
3.3.6
Clock Gating .........................................................................................................3-6
3.4
Resets and Power Modes..................................................................................................3-6
3.4.1
Hardware Reset....................................................................................................3-6
3.4.2
Watchdog Reset ...................................................................................................3-7
3.4.3
GPIO Reset ..........................................................................................................3-8
3.4.4
Run Mode .............................................................................................................3-9
3.4.5
Turbo Mode ..........................................................................................................3-9
3.4.6
Idle Mode ............................................................................................................3-10
3.4.7
3.4.8
33-MHz Idle Mode ..............................................................................................3-13
3.4.9
Sleep Mode.........................................................................................................3-15
3.5
Power Manager Registers ...............................................................................................3-22
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
3.5.7
3.5.8
3.5.9
3.6
Clocks Manager Registers...............................................................................................3-34
3.6.1
3.6.2
3.6.3
3.7
3.7.1
3.7.2
3.8
3.8.1
3.8.2
3.8.3
3.8.4
3.9
3.9.1
3.9.2
4
System Integration Unit ................................................................................................................4-1
4.1
General-Purpose I/O..........................................................................................................4-1
4.1.1
GPIO Operation ....................................................................................................4-1
4.1.2
4.1.3
iv
Intel® PXA255 Processor Developer's Manual