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SAF-C161PI Datasheet(PDF) 83 Page - Infineon Technologies AG |
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SAF-C161PI Datasheet(HTML) 83 Page - Infineon Technologies AG |
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83 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-1 1999-08 5 Interrupt and Trap Functions The architecture of the C161PI supports several mechanisms for fast and flexible response to service requests that can be generated from various sources internal or external to the microcontroller. These mechanisms include: Normal Interrupt Processing The CPU temporarily suspends the current program execution and branches to an interrupt service routine in order to service an interrupt requesting device. The current program status (IP, PSW, in segmentation mode also CSP) is saved on the internal system stack. A prioritization scheme with 16 priority levels allows the user to specify the order in which multiple interrupt requests are to be handled. Interrupt Processing via the Peripheral Event Controller (PEC) A faster alternative to normal software controlled interrupt processing is servicing an interrupt requesting device with the C161PI’s integrated Peripheral Event Controller (PEC). Triggered by an interrupt request, the PEC performs a single word or byte data transfer between any two locations in segment 0 (data pages 0 through 3) through one of eight programmable PEC Service Channels. During a PEC transfer the normal program execution of the CPU is halted for just 1 instruction cycle. No internal program status information needs to be saved. The same prioritization scheme is used for PEC service as for normal interrupt processing. PEC transfers share the 2 highest priority levels. Trap Functions Trap functions are activated in response to special conditions that occur during the execution of instructions. A trap can also be caused externally by the Non-Maskable Interrupt pin NMI. Several hardware trap functions are provided for handling erroneous conditions and exceptions that arise during the execution of an instruction. Hardware traps always have highest priority and cause immediate system reaction. The software trap function is invoked by the TRAP instruction, which generates a software interrupt for a specified interrupt vector. For all types of traps the current program status is saved on the system stack. External Interrupt Processing Although the C161PI does not provide dedicated interrupt pins, it allows to connect external interrupt sources and provides several mechanisms to react on external events, including standard inputs, non-maskable interrupts and fast external interrupts. These interrupt functions are alternate port functions, except for the non-maskable interrupt and the reset input. |
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