HD6473847RHV Datasheet, PDF (12/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 3 Exception Handling .............................................................................73
3.1 Exception Sources and Vector Address ............................................................................... 75
3.2 Register Descriptions ........................................................................................................... 77
3.2.1 Interrupt Edge Select Register (IEGR) ................................................................... 77
3.2.2 Interrupt Enable Register 1 (IENR1) ...................................................................... 78
3.2.3 Interrupt Enable Register 2 (IENR2) ...................................................................... 79
3.2.4 Interrupt Request Register 1 (IRR1) ....................................................................... 80
3.2.5 Interrupt Request Register 2 (IRR2) ....................................................................... 81
3.2.6 Wakeup Interrupt Request Register (IWPR)........................................................... 82
3.2.7 Wakeup Edge Select Register (WEGR).................................................................. 83
3.3 Reset Exception Handling.................................................................................................... 83
3.4 Interrupt Exception Handling............................................................................................... 84
3.4.1 External Interrupts .................................................................................................. 84
3.4.2 Internal Interrupts ................................................................................................... 85
3.4.3 Interrupt Handling Sequence .................................................................................. 86
3.4.4 Interrupt Response Time......................................................................................... 87
3.5 Usage Notes ......................................................................................................................... 89
3.5.1 Interrupts after Reset............................................................................................... 89
3.5.2 Notes on Stack Area Use ........................................................................................ 89
3.5.3 Interrupt Request Flag Clearing Method................................................................. 89
3.5.4 Notes on Rewriting Port Mode Registers................................................................ 90
Section 4 Clock Pulse Generators .......................................................................93
4.1 Features................................................................................................................................ 93
4.2 Register Description............................................................................................................. 95
4.3 System Clock Generator ...................................................................................................... 96
4.3.1 Connecting Crystal Resonator ................................................................................ 96
4.3.2 Connecting Ceramic Resonator .............................................................................. 98
4.3.3 External Clock Input Method.................................................................................. 99
4.3.4 On-Chip Oscillator Selection Method (H8/38104 Group Only) ............................. 99
4.4 Subclock Generator............................................................................................................ 100
4.4.1 Connecting 32.768-kHz/38.4-kHz Crystal Resonator........................................... 101
4.4.2 Pin Connection when Not Using Subclock........................................................... 102
4.4.3 External Clock Input............................................................................................. 102
4.5 Prescalers ........................................................................................................................... 103
4.5.1 Prescaler S ............................................................................................................ 103
4.5.2 Prescaler W ........................................................................................................... 103
4.6 Usage Notes ....................................................................................................................... 103
4.6.1 Note on Resonators............................................................................................... 103
4.6.2 Notes on Board Design ......................................................................................... 105
4.6.3 Definition of Oscillation Stabilization Standby Time........................................... 106
Rev. 7.00 Mar. 08, 2010 Page x of xxx
REJ09B0024-0700