H838537 datasheet(11/508 Pages) RENESAS

Part #	H838537

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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Rev. 1.00 May 30, 2008 Page xi of xx

3.2

Reset ................................................................................................................................... 59

3.2.1

Overview............................................................................................................. 59

3.2.2

Reset Sequence ................................................................................................... 59

3.2.3

Interrupt Immediately after Reset ....................................................................... 60

3.3

Interrupts............................................................................................................................. 61

3.3.1

Overview............................................................................................................. 61

3.3.2

Interrupt Control Registers ................................................................................. 63

3.3.3

External Interrupts .............................................................................................. 73

3.3.4

Internal Interrupts ............................................................................................... 74

3.3.5

Interrupt Operations ............................................................................................ 74

3.3.6

Interrupt Response Time..................................................................................... 79

3.4

Application Notes ...............................................................................................................80

3.4.1

Notes on Stack Area Use .................................................................................... 80

3.4.2

Notes on Rewriting Port Mode Registers............................................................ 81

3.4.3

Method for Clearing Interrupt Request Flags ..................................................... 83

Section 4 Clock Pulse Generators........................................................................85

4.1

Overview............................................................................................................................. 85

4.1.1

Block Diagram.................................................................................................... 85

4.1.2

System Clock and Subclock................................................................................ 85

4.2

System Clock Generator ..................................................................................................... 86

4.3

Subclock Generator............................................................................................................. 89

4.4

Prescalers ............................................................................................................................ 91

4.5

Note on Oscillators .............................................................................................................92

4.5.1

Definition of Oscillation Stabilization Wait Time .............................................. 93

4.5.2

Notes on Use of Crystal Oscillator Element

(Excluding Ceramic Oscillator Element) ............................................................ 95

Section 5 Power-Down Modes ............................................................................97

5.1

Overview............................................................................................................................. 97

5.1.1

System Control Registers.................................................................................. 100

5.2

Sleep Mode ....................................................................................................................... 104

5.2.1

Transition to Sleep Mode.................................................................................. 104

5.2.2

Clearing Sleep Mode......................................................................................... 105

5.2.3

Clock Frequency in Sleep (Medium-Speed) Mode........................................... 105

5.3

Standby Mode ................................................................................................................... 105

5.3.1

Transition to Standby Mode.............................................................................. 105

5.3.2

Clearing Standby Mode .................................................................................... 106

5.3.3

Oscillator Settling Time after Standby Mode is Cleared .................................. 107

5.3.4

Standby Mode Transition and Pin States .......................................................... 107

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