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C167CS Datasheet(PDF) 116 Page - Infineon Technologies AG |
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C167CS Datasheet(HTML) 116 Page - Infineon Technologies AG |
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116 / 517 page  C167CS Derivatives Interrupt and Trap Functions User’s Manual 5-33 V2.0, 2000-07 Note: The trap service routine must clear the respective trap flag, otherwise a new trap will be requested after exiting the service routine. Setting a trap request flag by software causes the same effects as if it had been set by hardware. In the case where e.g. an Undefined Opcode trap (class B) occurs simultaneously with an NMI trap (class A), both the NMI and the UNDOPC flag is set, the IP of the instruction with the undefined opcode is pushed onto the system stack, but the NMI trap is executed. After return from the NMI service routine, the IP is popped from the stack and immediately pushed again because of the pending UNDOPC trap. TFR Trap Flag Register SFR (FFACH/D6H) Reset Value: 0000H 15 14 13 12 11 10 9876 543210 NMI STK OF STK UF ----- UND OPC --- PRT FLT ILL OPA ILL INA ILL BUS rwh rwh rwh - - - - rwh - - - rwh rwh rwh rwh Bit Function ILLBUS Illegal External Bus Access Flag An external access has been attempted with no external bus defined. ILLINA Illegal Instruction Access Flag A branch to an odd address has been attempted. ILLOPA Illegal Word Operand Access Flag A word operand access (read or write) to an odd address has been attempted. PRTFLT Protection Fault Flag A protected instruction with an illegal format has been detected. UNDOPC Undefined Opcode Flag The currently decoded instruction has no valid C167CS opcode. STKUF Stack Underflow Flag The current stack pointer value exceeds the content of register STKUN. STKOF Stack Overflow Flag The current stack pointer value falls below the content of reg. STKOV. NMI Non Maskable Interrupt Flag A negative transition (falling edge) has been detected on pin NMI. |
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