S3C72Q5 Datasheet, PDF (8/330 Pages) Samsung semiconductor – 4-BIT CMOS MICROCONTROLLER

Table of Contents (Continued)
Part II — Hardware Descriptions
Section 6
Oscillator Circuits
Overview .............................................................................................................................................6-1
Main-System Oscillator Circuits....................................................................................................6-3
Sub-System Oscillator Circuits.....................................................................................................6-3
Power Control Register (PCON) ....................................................................................................6-4
Instruction Cycle Times................................................................................................................6-5
System Clock Mode Register (SCMOD) ........................................................................................6-6
Switching The CPU Clock ............................................................................................................6-8
Clock Output Mode Register (CLMOD) ..........................................................................................6-10
Clock Output Circuit ....................................................................................................................6-11
Clock Output Procedure...............................................................................................................6-11
Section 7
Interrupts
Overview .............................................................................................................................................7-1
Vectored Interrupts ......................................................................................................................7-2
Multiple Interrupts........................................................................................................................7-5
Interrupt Priority Register (IPR) .....................................................................................................7-7
External Interrupt 0 and 1 Mode Registers (IMOD0, IMOD1) ............................................................7-8
External Interrupt 2 Mode Register (IMOD2) ...................................................................................7-10
Interrupt Flags .............................................................................................................................7-12
Section 8
Power-Down
Overview .............................................................................................................................................8-1
Idle Mode Timing Diagrams ..........................................................................................................8-4
Stop Mode Timing Diagrams.........................................................................................................8-5
Recommended Connections for Unused Pins .................................................................................8-7
S3C72Q5/P72Q5 MICROCONTROLLER
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