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3. Interrupt Control Circuit
3.6 Software Interrupt (INTSW)
TMP89FM42
RA003
3.6
Software Interrupt (INTSW)
Executing the SWI instruction generates a software interrupt and immediately starts interrupt processing (INTSW
is the top-priority interrupt).
Use the SWI instruction only for address error detection or for debugging described below.
3.6.1
Address error detection
0xFF is read if for some cause such as noise the CPU attempts to fetch an instruction from a non-existent
memory address. Code 0xFF is an SWI instruction, so a software interrupt is generated and an address error is
detected. The address error detection range can be further expanded by writing 0xFF to unused areas in the pro-
gram memory.
3.6.2
Debugging
Debugging efficiency can be increased by placing the SWI instruction at the software break point setting
address.
3.7
Undefined Instruction Interrupt (INTUNDEF)
When the CPU tries to fetch and execute an instruction that is not defined, INTUNDEF is generated and starts the
interrupt processing. INTUNDEF is accepted even if another non-maskable interrupt is in process. The current pro-
cess is discontinued and the INTUNDEF interrupt process starts soon after it is requested.
Note: The undefined instruction interrupt (INTUNDEF) forces the CPU to jump into the interrupt vector address, as soft-
ware interrupt (SWI) does.
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......