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7.2 Bus Control ................................................................................................................................................46
7.2.1 Address Bus .......................................................................................................................................46
7.2.2 Data Bus ............................................................................................................................................46
7.2.3 Chip Select Signal..............................................................................................................................46
7.2.4 Read and Write Signals .....................................................................................................................48
7.2.5 ALE Signal .........................................................................................................................................48
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7.2.6 RDY Signal ........................................................................................................................................ 49
7.2.8 BCLK Output ......................................................................................................................................50
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7.2.7 HOLD Signal ......................................................................................................................................50
7.2.9 External Bus Status When Internal Area Accessed ...........................................................................52
7.2.10 Software Wait................................................................................................................................... 52
8. Clock Generating Circuit .....................................................................................................56
8.1 Types of Clock Generating Circuit.............................................................................................................. 56
8.1.1 Main Clock .........................................................................................................................................64
8.1.2 Sub Clock...........................................................................................................................................65
8.1.3 On-chip Oscillator Clock ....................................................................................................................66
8.1.4 PLL Clock ...........................................................................................................................................66
8.2 CPU Clock and Peripheral Function Clock ................................................................................................ 68
8.2.1 CPU Clock and BCLK ........................................................................................................................68
8.2.2 Peripheral Function Clock ..................................................................................................................68
8.3 Clock Output Function ...............................................................................................................................68
8.4 Power Control ............................................................................................................................................69
8.4.1 Normal Operation Mode.....................................................................................................................69
8.4.2 Wait Mode .......................................................................................................................................... 71
8.4.3 Stop Mode..........................................................................................................................................73
8.5 Oscillation Stop and Re-oscillation Detection Function ............................................................................. 78
8.5.1 Operation When CM27 Bit = 0 (Oscillation Stop Detection Reset) .................................................... 78
8.5.2 Operation When CM27 Bit = 1 (Oscillation Stop, Re-oscillation Detection Interrupt) ........................ 78
8.5.3 How to Use Oscillation Stop and Re-oscillation Detection Function ..................................................79
9. Protection ............................................................................................................................ 80
10. Interrupt ............................................................................................................................. 81
10.1 Type of Interrupts .....................................................................................................................................81
10.2 Software Interrupts................................................................................................................................... 82
10.2.1 Undefined Instruction Interrupt.........................................................................................................82
10.2.2 Overflow Interrupt ............................................................................................................................82
10.2.3 BRK Interrupt ...................................................................................................................................82
10.2.4 INT Instruction Interrupt ................................................................................................................... 82
10.3 Hardware Interrupts .................................................................................................................................83
10.3.1 Special Interrupts .............................................................................................................................83
10.3.2 Peripheral Function Interrupts..........................................................................................................83
10.4 Interrupts and Interrupt Vector ................................................................................................................. 84
10.4.1 Fixed Vector Tables..........................................................................................................................84
10.4.2 Relocatable Vector Tables ...............................................................................................................84
10.5 Interrupt Control .......................................................................................................................................86
10.5.1 I Flag ................................................................................................................................................88
10.5.2 IR Bit ................................................................................................................................................88
10.5.3 ILVL2 to ILVL0 Bits and IPL ............................................................................................................. 88