Rev. 3.0, 10/02, page xlii of lviii
Section 20 Masked ROM...................................................................................593
20.1
Features .............................................................................................................................593
Section 21 Clock Pulse Generator .....................................................................595
21.1
Register Descriptions ........................................................................................................596
21.1.1 System Clock Control Register (SCKCR)............................................................596
21.1.2 Low-Power Control Register (LPWRCR)............................................................598
21.2
System Clock Oscillator ....................................................................................................599
21.2.1 Connecting a Crystal Resonator ...........................................................................599
21.2.2 Inputting an External Clock .................................................................................600
21.3
Duty Adjustment Circuit ...................................................................................................601
21.4
Medium-Speed Clock Divider...........................................................................................601
21.5
Bus Master Clock Selection Circuit ..................................................................................601
21.6
USB Operating Clock........................................................................................................602
21.6.1 Connecting a Ceramic Resonator .........................................................................602
21.6.2 Inputting an 48-MHz External Clock ...................................................................602
21.6.3 Pin Handling when 48-MHz External Clock is not Needed
(On-chip PLL Circuit is Used) .............................................................................603
21.7
PLL Circuit for USB .........................................................................................................603
21.8
Usage Notes.......................................................................................................................604
21.8.1 Note on Crystal Resonator ...................................................................................604
21.8.2 Note on Board Design ..........................................................................................604
21.8.3 Note on Switchover of External Clock.................................................................605
Section 22 Power-Down Modes ........................................................................607
22.1
Register Descriptions ........................................................................................................610
22.1.1 Standby Control Register (SBYCR).....................................................................610
22.1.2 System Clock Control Register (SCKCR)............................................................612
22.1.3 Module Stop Control Registers A to C (MSTPCRA to MSTPCRC) ...................612
22.2
Medium-Speed Mode ........................................................................................................614
22.3
Sleep Mode........................................................................................................................615
22.3.1 Transition to Sleep Mode .....................................................................................615
22.3.2 Exiting Sleep Mode..............................................................................................615
22.4
Software Standby Mode ....................................................................................................615
22.4.1 Transition to Software Standby Mode..................................................................615
22.4.2 Clearing Software Standby Mode ........................................................................616
22.4.3 Setting Oscillation Stabilization Time after Clearing Software Standby Mode ...616
22.4.4 Software Standby Mode Application Example ....................................................617
22.5
Hardware Standby Mode...................................................................................................618
22.5.1 Transition to Hardware Standby Mode ................................................................618
22.5.2 Clearing Hardware Standby Mode .......................................................................618
22.5.3 Hardware Standby Mode Timing .........................................................................619
22.5.4 Hardware Standby Mode Timings .......................................................................619
Содержание H8S/2215 Series
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