Microchip PIC24HJ12GP202 Handleiding

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© 2008 Microchip Technology Inc. Preliminary DS70224C-page 6-1
Interrupts
6
Section 6. Interrupts
HIGHLIGHTS
This section of the manual contains the following topics:
6.1 Introduction .................................................................................................................... 6-2
6.2 Non-Maskable Traps...................................................................................................... 6-7
6.3 Interrupt Processing Timing ......................................................................................... 6-12
6.4 Interrupt Control and Status Registers......................................................................... 6-15
6.5 Interrupt Setup Procedures.......................................................................................... 6-55
6.6 Design Tips .................................................................................................................. 6-60
6.7 Related Application Notes............................................................................................ 6-61
6.8 Revision History ...........................................................................................................6-62
PIC24H Family Reference Manual
DS70224C-page 6-2 Preliminary © 2008 Microchip Technology Inc.
6.1 INTRODUCTION
The PIC24H Interrupt Controller module reduces the numerous peripheral interrupt request
signals to a single interrupt request signal to the PIC24H CPU. It has these features:
• Up to eight processor exceptions and software traps
• Seven user selectable priority levels
• Interrupt Vector Table (IVT) with up to 126 vectors
• A unique vector for each interrupt or exception source
• Fixed priority within a specified user priority level
• Alternate Interrupt Vector Table (AIVT) for debugging support
• Fixed interrupt entry and return latencies
6.1.1 Interrupt Vector Table
Figure 6-1 shows the IVT resides in program memory starting at location 0x000004. The IVT
contains 126 vectors consisting of eight non-maskable trap vectors and up to 118 sources of
interrupt. In general, each interrupt source has its own vector. Each interrupt vector contains a
24-bit-wide address. The value programmed into each interrupt vector location is the starting
address of the associated Interrupt Service Routine (ISR).
6.1.2 Alternate Vector Table
Figure 6-1 shows the AIVT that is located after the IVT. Access to the AIVT is provided by the
Enable Alternate Interrupt Vector Table (ALTIVT) control bit in Interrupt Control Register 2
(INTCON2<15>). If the ALTIVT bit is set, all interrupt and exception processes use the alternate
vectors instead of the default vectors. The alternate vectors are organized in the same manner
as the default vectors.
The AIVT supports emulation and debugging by providing a means to switch between
an application and a support environment without requiring the interrupt vectors to be
reprogrammed. This feature also enables switching between applications for evaluation of
different software algorithms at run time. If the AIVT is not needed, the AIVT should be
programmed with the same addresses used in the IVT.
6.1.3 Reset Sequence
A device Reset is not a true exception because the interrupt controller is not involved in the Reset
process. The PIC24H device clears its registers in response to a Reset, which forces the
Program Counter (PC) to zero. The processor then begins program execution at location
0x000000. The user programs a GOTO instruction at the Reset address, that redirects program
execution to the appropriate start-up routine.
Note: Any unimplemented or unused vector locations in the IVT and AIVT should be
programmed with the address of a default interrupt handler routine that contains a
RESET instruction.
© 2008 Microchip Technology Inc. Preliminary DS70224C-page 6-3
Section 6. Interrupts
Interrupts
6
Figure 6-1: Interrupt Vector Table
Refer to Table 6-1
Vector details
for Interrupt
IVTAIVT
Decreasing Natural Order Priority
Reset – GOTO Instruction 0x000000
Reset – GOTO Address 0x000002
Reserved 0x000004
Oscillator Fail Trap Vector 0x000006
Address Error Trap Vector 0x000008
Stack Error Trap Vector 0x00000A
Math Error Trap Vector 0x00000C
DMAC Error Trap Vector 0x00000E
Reserved 0x000010
Reserved 0x000012
Interrupt Vector 0 0x000014
Interrupt Vector 1 0x000016
: :
: :
: :
Interrupt Vector 52 0x00007C
Interrupt Vector 53 0x00007E
Interrupt Vector 54 0x000080
: :
: :
: :
Interrupt Vector 116 0x0000FC
Interrupt Vector 117 0x0000FE
Reserved 0x000100
Reserved 0x000102
Reserved 0x000104
Oscillator Fail Trap Vector 0x000106
Address Error Trap Vector 0x000108
Stack Error Trap Vector 0x00010A
Math Error Trap Vector 0x00010C
DMAC Error Trap Vector 0x00010E
Reserved 0x000110
Reserved 0x000112
Interrupt Vector 0 0x000114
Interrupt Vector 1 0x000116
: :
: :
: :
Interrupt Vector 52 0x00017C
Interrupt Vector 53 0x00017E
Interrupt Vector 54 0x000180
: :
: :
: :
Interrupt Vector 116 0x0001FC
Interrupt Vector 117 0x0001FE
Start of Code 0x000200

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC24HJ12GP202

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