H838700S datasheet(11/402 Pages) RENESAS

Part #	H838700S

Description	16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series

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Manufacturer	RENESAS [Renesas Technology Corp]

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11 / 402 page

Rev. 1.00 Dec. 13, 2007 Page xi of xviii

3.2.1

Interrupt Edge Select Register (IEGR) ............................................................... 59

3.2.2

Interrupt Enable Register 1 (IENR1) .................................................................. 60

3.2.3

Interrupt Enable Register 2 (IENR2) .................................................................. 61

3.2.4

Interrupt Request Register 1 (IRR1) ................................................................... 62

3.2.5

Interrupt Request Register 2 (IRR2) ................................................................... 63

3.2.6

Wakeup Interrupt Request Register (IWPR)....................................................... 64

3.2.7

Wakeup Edge Select Register (WEGR).............................................................. 65

3.3

Reset Exception Handling................................................................................................... 65

3.4

Interrupt Exception Handling ............................................................................................. 66

3.4.1

External Interrupts .............................................................................................. 66

3.4.2

Internal Interrupts ............................................................................................... 67

3.4.3

Interrupt Handling Sequence .............................................................................. 68

3.4.4

Interrupt Response Time..................................................................................... 69

3.5

Usage Notes ........................................................................................................................ 71

3.5.1

Interrupts after Reset........................................................................................... 71

3.5.2

Notes on Stack Area Use .................................................................................... 71

3.5.3

Interrupt Request Flag Clearing Method............................................................. 71

3.5.4

Notes on Rewriting Port Mode Registers............................................................ 72

Section 4 Clock Pulse Generators........................................................................75

4.1

Features............................................................................................................................... 75

4.2

System Clock Generator ..................................................................................................... 76

4.2.1

Connecting Crystal Resonator ............................................................................ 76

4.2.2

Connecting Ceramic Resonator .......................................................................... 77

4.2.3

External Clock Input Method.............................................................................. 77

4.3

Subclock Generator............................................................................................................. 78

4.3.1

Connecting 32.768-kHz/38.4-kHz Crystal Resonator......................................... 78

4.3.2

Pin Connection when Not Using Subclock ......................................................... 79

4.3.3

External Clock Input ........................................................................................... 80

4.4

Prescalers ............................................................................................................................ 80

4.4.1

Prescaler S .......................................................................................................... 80

4.4.2

Prescaler W ......................................................................................................... 80

4.5

Usage Notes ........................................................................................................................ 81

4.5.1

Note on Resonators ............................................................................................. 81

4.5.2

Notes on Board Design ....................................................................................... 82

4.5.3

Definition of Oscillation Stabilization Standby Time......................................... 83

4.5.4

Notes on Use of Resonator ................................................................................. 85

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