HD64F38602R Datasheet, PDF (10/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

3.4 Register Descriptions........................................................................................................... 46
3.4.1 Interrupt Edge Select Register (IEGR) ................................................................... 47
3.4.2 Interrupt Enable Register 1 (IENR1) ...................................................................... 48
3.4.3 Interrupt Enable Register 2 (IENR2) ...................................................................... 49
3.4.4 Interrupt Flag Register 1 (IRR1)............................................................................. 50
3.4.5 Interrupt Flag Register 2 (IRR2)............................................................................. 51
3.5 Interrupt Sources.................................................................................................................. 52
3.5.1 External Interrupts .................................................................................................. 52
3.5.2 Internal Interrupts ................................................................................................... 53
3.6 Operation ............................................................................................................................. 53
3.6.1 Interrupt Exception Handling Sequence ................................................................. 56
3.7 Stack Status after Exception Handling................................................................................. 57
3.7.1 Interrupt Response Time......................................................................................... 57
3.8 Usage Notes ......................................................................................................................... 58
3.8.1 Notes on Stack Area Use ........................................................................................ 58
3.8.2 Notes on Switching Functions of External Interrupt Pins....................................... 59
3.8.3 Method for Clearing Interrupt Request Flags ......................................................... 60
3.8.4 Conflict between Interrupt Generation and Disabling ............................................ 60
3.8.5 Instructions that Disable Interrupts......................................................................... 61
3.8.6 Interrupts during Execution of EEPMOV Instruction ............................................ 61
3.8.7 IENR Clearing ........................................................................................................ 61
Section 4 Clock Pulse Generators ....................................................................... 63
4.1 Register Description ............................................................................................................ 64
4.1.1 Oscillator Control Register (OSCCR) .................................................................... 64
4.2 System Clock Oscillator ...................................................................................................... 66
4.2.1 Connecting Crystal Resonator ................................................................................ 66
4.2.2 Connecting Ceramic Resonator .............................................................................. 66
4.2.3 External Clock Input Method ................................................................................. 67
4.2.4 On-Chip Oscillator Selection Method .................................................................... 67
4.3 Subclock Oscillator.............................................................................................................. 68
4.3.1 Connecting 32.768-kHz/38.4-kHz Crystal Resonator ............................................ 68
4.3.2 Pin Connection when not Using Subclock.............................................................. 69
4.3.3 External Clock Input Method ................................................................................. 70
4.3.4 On-Chip Oscillator Selection Method .................................................................... 70
4.4 Prescalers ............................................................................................................................. 71
4.4.1 Prescaler S .............................................................................................................. 71
4.4.2 Prescaler W............................................................................................................. 71
4.5 Usage Notes ......................................................................................................................... 72
4.5.1 Note on Resonators and Resonator Circuits ........................................................... 72
Rev. 3.00 May 15, 2007 Page x of xxxii