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3.2.7
3.3
Reset Exception Handling................................................................................................. 52
3.4
Interrupt Exception Handling............................................................................................ 53
3.4.1
3.4.2
3.4.3
3.4.4
3.5
Usage Notes ...................................................................................................................... 58
3.5.1
3.5.2
3.5.3
Section 4 Address Break....................................................................................59
4.1
Register Descriptions ........................................................................................................ 59
4.1.1
4.1.2
4.1.3
4.1.4
4.2
Operation .......................................................................................................................... 63
Section 5 Clock Pulse Generators .....................................................................65
5.1
Features ............................................................................................................................. 66
5.2
Register Descriptions ........................................................................................................ 67
5.2.1
5.2.2
5.2.3
5.2.4
5.3
System Clock Select Operation......................................................................................... 71
5.3.1
5.3.2
5.4
Trimming of Internal RC Oscillator Frequency ................................................................ 78
5.5
External Oscillators........................................................................................................... 80
5.5.1
5.5.2
5.5.3
5.6
Prescaler............................................................................................................................ 81
5.6.1
5.7
Usage Notes ...................................................................................................................... 82
5.7.1
5.7.2
Rev. 1.00, 11/03, page x of xxviii
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Wakeup Interrupt Flag Register (IWPR) ............................................................. 51
External Interrupts ............................................................................................... 53
Internal Interrupts................................................................................................. 54
Interrupt Handling Sequence ............................................................................... 54
Interrupt Response Time...................................................................................... 56
Interrupts after Reset............................................................................................ 58
Notes on Stack Area Use ..................................................................................... 58
Notes on Rewriting Port Mode Registers............................................................. 58
Address Break Control Register (ABRKCR)....................................................... 60
Address Break Status Register (ABRKSR) ......................................................... 61
Break Address Registers (BARH, BARL)........................................................... 62
Break Data Registers (BDRH, BDRL) ................................................................ 62
RC Control Register (RCCR) .............................................................................. 67
RC Trimming Data Protect Register (RCTRMDPR)........................................... 68
RC Trimming Data Register (RCTRMDR) ......................................................... 69
Clock Control/Status Register (CKCSR) ............................................................. 69
Clock Control Operation...................................................................................... 72
Clock Change Timing .......................................................................................... 75
Connecting Crystal Resonator ............................................................................. 80
Connecting Ceramic Resonator ........................................................................... 81
External Clock Input Method............................................................................... 81
Prescaler S ........................................................................................................... 81
Note on Resonators .............................................................................................. 82
Notes on Board Design ........................................................................................ 82
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