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CONTENTS
CHAPTER 1
OVERVIEW ................................................................................................... 1
1.1
MB89950/950A Series Features ........................................................................................................... 2
1.2
MB89950/950A Series Product Range ................................................................................................. 4
1.3
Differences among Products ................................................................................................................ 6
1.4
Block Diagram of MB89950/950A Series ............................................................................................ 7
1.5
Pin Assignment ..................................................................................................................................... 8
1.6
Package Dimensions .......................................................................................................................... 10
1.7
I/O Pins and Pin Functions ................................................................................................................. 12
CHAPTER 2
HANDLING DEVICES ................................................................................ 17
2.1
Notes on Handling Devices ................................................................................................................ 18
CHAPTER 3
CPU ............................................................................................................ 21
3.1
Memory Space .................................................................................................................................... 22
3.1.1
Special Areas ................................................................................................................................. 24
3.1.2
Storing 16-bit Data in Memory ....................................................................................................... 26
3.2
Dedicated Registers ........................................................................................................................... 27
3.2.1
Condition Code Register (CCR) .................................................................................................... 29
3.2.2
Register Bank Pointer (RP) ........................................................................................................... 32
3.3
General-purpose Registers ................................................................................................................. 33
3.4
Interrupts ............................................................................................................................................. 35
3.4.1
Interrupt Level Setting Registers (ILR1, ILR2, ILR3) ..................................................................... 36
3.4.2
Interrupt Processing ....................................................................................................................... 37
3.4.3
Multiple Interrupts .......................................................................................................................... 39
3.4.4
Interrupt Processing Time .............................................................................................................. 40
3.4.5
Stack Operation during Interrupt Processing ................................................................................. 41
3.4.6
Stack Area for Interrupt Processing ............................................................................................... 42
3.5
Resets ................................................................................................................................................. 43
3.5.1
External Reset Pin ......................................................................................................................... 45
3.5.2
Reset Operation ............................................................................................................................. 46
3.5.3
Pin States during Reset ................................................................................................................. 48
3.6
Clocks ................................................................................................................................................. 49
3.6.1
Clock Generator ............................................................................................................................. 51
3.6.2
Clock Controller ............................................................................................................................. 53
3.6.3
Oscillation Stabilization Delay Time ............................................................................................... 55
3.7
Standby Mode (Low-power Consumption) ......................................................................................... 57
3.7.1
Operating States in Standby Mode ................................................................................................ 58
3.7.2
Sleep Mode ................................................................................................................................... 59
3.7.3
Stop Mode ..................................................................................................................................... 60
3.7.4
Standby Control Register (STBC) .................................................................................................. 61
3.7.5
State Transition Diagram ............................................................................................................... 63
3.7.6
Notes on Using Standby Mode ...................................................................................................... 65
3.8
Memory Access Mode ........................................................................................................................ 67
