Datasheet

Table Of Contents
Rev. 2.00 Jul. 04, 2007 Page xi of xl
5.2.4 Selecting On-Chip Oscillator for System Clock ..................................................... 90
5.3 Subclock Generator..............................................................................................................91
5.3.1 Connecting 32.768-kHz/38.4-kHz Crystal Resonator............................................. 91
5.3.2 Pin Connection when not Using Subclock.............................................................. 92
5.3.3 How to Input the External Clock ............................................................................ 93
5.4 Prescalers ............................................................................................................................. 94
5.4.1 Prescaler S .............................................................................................................. 94
5.4.2 Prescaler W ............................................................................................................. 94
5.5 Usage Notes ......................................................................................................................... 95
5.5.1 Note on Resonators and Resonator Circuits............................................................ 95
5.5.2 Notes on Board Design ........................................................................................... 97
5.5.3 Definition of Oscillation Stabilization Wait Time .................................................. 97
5.5.4 Note on Subclock Stop State................................................................................... 98
5.5.5 Note on the Oscillation Stabilization of Resonators ............................................... 99
5.5.6 Note on Using On-Chip Power-On Reset ............................................................... 99
5.5.7 Note on Using the On-Chip Emulator..................................................................... 99
Section 6 Power-Down Modes ..........................................................................101
6.1 Register Descriptions ......................................................................................................... 102
6.1.1 System Control Register 1 (SYSCR1).................................................................. 102
6.1.2 System Control Register 2 (SYSCR2).................................................................. 104
6.1.3 System Control Register 3 (SYSCR3).................................................................. 105
6.1.4 Clock Halt Registers 1 to 3 (CKSTPR1 to CKSTPR3) ........................................ 107
6.2 Mode Transitions and States of LSI................................................................................... 110
6.2.1 Sleep Mode ........................................................................................................... 116
6.2.2 Standby Mode....................................................................................................... 116
6.2.3 Watch Mode.......................................................................................................... 117
6.2.4 Subsleep Mode...................................................................................................... 117
6.2.5 Subactive Mode .................................................................................................... 118
6.2.6 Active (Medium-Speed) Mode ............................................................................. 118
6.3 Direct Transition ................................................................................................................ 119
6.3.1 Direct Transition from Active (High-Speed) Mode to Active
(Medium-Speed) Mode......................................................................................... 119
6.3.2 Direct Transition from Active (High-Speed) Mode to Subactive Mode............... 120
6.3.3 Direct Transition from Active (Medium-Speed) Mode to Active
(High-Speed) Mode .............................................................................................. 120
6.3.4 Direct Transition from Active (Medium-Speed) Mode to Subactive Mode ......... 121
6.3.5 Direct Transition from Subactive Mode to Active (High-Speed) Mode............... 121
6.3.6 Direct Transition from Subactive Mode to Active (Medium-Speed) Mode ......... 122
6.3.7 Notes on External Input Signal Changes before/after Direct Transition............... 123