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PXAG49KBBD Datasheet(PDF) 31 Page - NXP Semiconductors

Part No. PXAG49KBBD
Description  XA 16-bit microcontroller family
Download  42 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

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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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