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PXAG49KBBD Datasheet(PDF) 31 Page - NXP Semiconductors |
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PXAG49KBBD Datasheet(HTML) 31 Page - NXP Semiconductors |
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31 / 42 page  Philips Semiconductors Preliminary data XA-G49 XA 16-bit microcontroller family 64K Flash/2K RAM, watchdog, 2 UARTs 2001 Jun 27 31 INTERRUPTS The XA-G49 supports 38 vectored interrupt sources. These include 9 maskable event interrupts, 7 exception interrupts, 16 trap interrupts, and 7 software interrupts. The maskable interrupts each have 8 priority levels and may be globally and/or individually enabled or disabled. The XA defines four types of interrupts: • Exception Interrupts – These are system level errors and other very important occurrences which include stack overflow, divide-by-0, and reset. • Event interrupts – These are peripheral interrupts from devices such as UARTs, timers, and external interrupt inputs. • Software Interrupts – These are equivalent of hardware interrupt, but are requested only under software control. • Trap Interrupts – These are TRAP instructions, generally used to call system services in a multi-tasking system. Exception interrupts, software interrupts, and trap interrupts are generally standard for XA derivatives and are detailed in the XA User Guide. Event interrupts tend to be different on different XA derivatives. The XA-G49 supports a total of 9 maskable event interrupt sources (for the various XA peripherals), seven software interrupts, 5 exception interrupts (plus reset), and 16 traps. The maskable event interrupts share a global interrupt disable bit (the EA bit in the IEL register) and each also has a separate individual interrupt enable bit (in the IEL or IEH registers). Only three bits of the IPA register values are used on the XA-G49. Each event interrupt can be set to occur at one of 8 priority levels via bits in the Interrupt Priority (IP) registers, IPA0 through IPA5. The value 0 in the IPA field gives the interrupt priority 0, in effect disabling the interrupt. A value of 1 gives the interrupt a priority of 9, the value 2 gives priority 10, etc. The result is the same as if all four bits were used and the top bit set for all values except 0. Details of the priority scheme may be found in the XA User Guide. The complete interrupt vector list for the XA-G49, including all 4 interrupt types, is shown in the following tables. The tables include the address of the vector for each interrupt, the related priority register bits (if any), and the arbitration ranking for that interrupt source. The arbitration ranking determines the order in which interrupts are processed if more than one interrupt of the same priority occurs simultaneously. Table 8. Interrupt Vectors EXCEPTION/TRAPS PRECEDENCE DESCRIPTION VECTOR ADDRESS ARBITRATION RANKING Reset (h/w, watchdog, s/w) 0000–0003 0 (High) Breakpoint (h/w trap 1) 0004–0007 1 Trace (h/w trap 2) 0008–000B 1 Stack Overflow (h/w trap 3) 000C–000F 1 Divide by 0 (h/w trap 4) 0010–0013 1 User RETI (h/w trap 5) 0014–0017 1 TRAP 0– 15 (software) 0040–007F 1 EVENT INTERRUPTS DESCRIPTION FLAG BIT VECTOR ADDRESS ENABLE BIT INTERRUPT PRIORITY ARBITRATION RANKING External interrupt 0 IE0 0080–0083 EX0 IPA0.2–0 (PX0) 2 Timer 0 interrupt TF0 0084–0087 ET0 IPA0.6–4 (PT0) 3 External interrupt 1 IE1 0088–008B EX1 IPA1.2–0 (PX1) 4 Timer 1 interrupt TF1 008C–008F ET1 IPA1.6–4 (PT1) 5 Timer 2 interrupt TF2(EXF2) 0090–0093 ET2 IPA2.2–0 (PT2) 6 Serial port 0 Rx RI.0 00A0–00A3 ERI0 IPA4.2–0 (PRIO) 7 Serial port 0 Tx TI.0 00A4–00A7 ETI0 IPA4.6–4 (PTIO) 8 Serial port 1 Rx RI.1 00A8–00AB ERI1 IPA5.2–0 (PRT1) 9 Serial port 1 Tx TI.1 00AC–00AF ETI1 IPA5.6–4 (PTI1) 10 SOFTWARE INTERRUPTS DESCRIPTION FLAG BIT VECTOR ADDRESS ENABLE BIT INTERRUPT PRIORITY Software interrupt 1 SWR1 0100–0103 SWE1 (fixed at 1) Software interrupt 2 SWR2 0104–0107 SWE2 (fixed at 2) Software interrupt 3 SWR3 0108–010B SWE3 (fixed at 3) Software interrupt 4 SWR4 010C–010F SWE4 (fixed at 4) Software interrupt 5 SWR5 0110–0113 SWE5 (fixed at 5) Software interrupt 6 SWR6 0114–0117 SWE6 (fixed at 6) Software interrupt 7 SWR7 0118–011B SWE7 (fixed at 7) |
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