NEC switch - Multiplexed Interrupt Servicing

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CHAPTER 11 INTERRUPT FUNCTIONS

User’s Manual U12978EJ3V0UD

175

11.4.3 Multiplexed interrupt servicing

Servicing in which another interrupt is acknowledged while an interrupt is being processed is called multiplexed

interrupt servicing.

Multiplexed interrupt is not performed unless interrupt requests are enabled (IE = 1) (except the non-maskable

interrupt request). Other interrupt requests are disabled (IE = 0) as soon as an interrupt request is acknowledged.

Therefore, it is necessary to set (1) the IE flag to realize the interrupt enable state using the EI instruction during

interrupt request servicing in order to enable multiplexed interrupt servicing.

Main Page

Default Chapter10
- Table of Contents10
Chapter 1 General21
- Features21
- Applications21
- Ordering Information21
- Pin Configuration (Top View)22
- 0S Series Lineup23
- Block Diagram26
- Functions27
Chapter 2 Pin Functions28
- List of Pin Functions28
- Pin Functions30
- Pin I/O Circuits and Recommended Connection of Unused Pins33
  - Pin I/O Circuits34
Chapter 3 Cpu Architecture35
- Memory Space35
- Processor Registers40
- Instruction Address Addressing48
- Operand Address Addressing51
Chapter 4 Port Functions57
- Port Functions57
- Port Types57
- Functions of Ports58
- Port Configuration59
- Registers Controlling Port Function69
- Port Function Operation72
Chapter 5 Clock Generator73
- Clock Generator Functions73
- Clock Generator Configuration73
  - Block Diagram of Clock Generator73
  - Configuration of Clock Generator73
- Register Controlling Clock Generator74
  - Format of Processor Clock Control Register74
- System Clock Oscillators75
- Clock Generator Operation77
- Changing Setting of CPU Clock78
  - Time Required for Switching CPU Clock78
  - Switching CPU Clock78
    - Switching of CPU Clock78
    - Maximum Time Required for Switching CPU Clock78
Chapter 6 8-Bit Timer/Event Counters 00 and 0179
- Functions of 8-Bit Timer/Event Counters 00 and 0179
  - Interval Time of 8-Bit Timer 0079
  - Interval Time of 8-Bit Timer/Event Counter 0179
- Configuration of 8-Bit Timer/Event Counters 00 and 0180
- Registers Controlling 8-Bit Timer/Event Counters 00 and 0182
- Operation of 8-Bit Timer/Event Counters 00 and 0185
- Notes on Using 8-Bit Timer/Event Counters 00 and 0190
  - Start Timing of 8-Bit Timer Counter90
  - Timing of External Event Counter Operation90
Chapter 7 Watchdog Timer91
- Watchdog Timer Functions91
  - Inadvertent Loop Detection Time of Watchdog Timer91
  - Interval Time91
- Watchdog Timer Configuration92
  - Block Diagram of Watchdog Timer92
  - Configuration of Watchdog Timer92
- Registers Controlling Watchdog Timer93
  - Format of Timer Clock Select Register 293
  - Format of Watchdog Timer Mode Register94
- Watchdog Timer Operation95
Chapter 8 Usb Function97
- USB Overview97
  - USB Bus Topology (Desktop Type PC)97
- USB Function Features98
- USB Function Configuration98
- Registers Controlling USB Function109
- USB Function Operation122
- Interrupt Request from USB Function127
- USB Function Control130
  - Relationship between Packets and Operation Modes130
  - Interrupt Servicing Flow136
- USB Function Internal Circuit Operations140
Chapter 9 Serial Interface 10154
- Functions of Serial Interface 10154
- Configuration of Serial Interface 10155
  - Block Diagram of Serial Interface 10156
- Register Controlling Serial Interface 10157
  - Format of Serial Operation Mode Register 10157
  - Operating Mode Settings of Serial Interface 10158
- Operation of Serial Interface 10159
Chapter 10 Regulator162
- Block Diagram of Regulator and USB Driver/Receiver162
Chapter 11 Interrupt Functions163
- Interrupt Function Types163
- Interrupt Sources and Configuration163
  - Interrupt Source List164
  - Basic Configuration of Interrupt Function165
- Registers Controlling Interrupt Function166
- Interrupt Servicing Operation171
Chapter 12 Standby Function178
- Standby Function and Configuration178
- Standby Function Operation180
Chapter 13 Reset Function186
- Block Diagram of Reset Function186
- Reset Timing by RESET Input187
- Reset Timing by Overflow in Watchdog Timer187
- Reset Timing by RESET Input in STOP Mode187
- Hardware Status after Reset188
- Μ Μ Μ Μ PD78F9801190
CHAPTER 14 Μ Μ Μ Μ PD78F9801190
- Flash Memory Characteristics191
Chapter 15 Instruction Set200
- Operation200
- Operation List202
- Instructions Listed by Addressing Type207
Chapter 16 Electrical Specifications210
Chapter 17 Package Drawings219
Chapter 18 Recommended Soldering Conditions220
- Surface Mounting Type Soldering Conditions220
Appendix Adevelopment Tools221
- A-1 Development Tools222
- Software Package223
  - A.1 Software Package223
- Language Processing Software223
- Control Software224
  - A.3 Control Software224
- Flash Memory Writing Tools224
- Debugging Tools (Hardware)225
- Debugging Tools (Software)226
- Notes on Target System Design227
  - A-2 Distance between In-Circuit Emulator and Conversion Adapter227
  - A-3 Connection Condition of Target System (NP-H44GB-TQ)228
Appendix Bregister Index229
- B.1 Register Index (Alphabetic Order of Register Name)229
- B.2 Register Index (Alphabetic Order of Register Symbol)231
Appendix C Revision History233

NEC switch - Multiplexed Interrupt Servicing

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