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型号： DSPIC30F3014-30I/ML
厂商： Microchip Technology
文件页数： 113/153页
文件大小： 0K
描述： IC DSPIC MCU/DSP 24K 44QFN
产品培训模块： Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
标准包装： 45
系列： dsPIC™ 30F
核心处理器： dsPIC
芯体尺寸： 16-位
速度： 30 MIP
连通性： I²C，SPI，UART/USART
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 30
程序存储器容量： 24KB（8K x 24）
程序存储器类型： 闪存
EEPROM 大小： 1K x 8
RAM 容量： 2K x 8
电压 - 电源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
数据转换器： A/D 13x12b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-VQFN 裸露焊盘
包装： 管件
产品目录页面： 651 (CN2011-ZH PDF)
配用： XLT44QFN2-ND - SOCKET TRAN ICE 44QFN/40DIP
AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名称： DSPIC30F301430IML
dsPIC30F3014/4013
DS70138G-page 62
2010 Microchip Technology Inc.
8.3
Traps
Traps can be considered as non-maskable interrupts,
indicating a software or hardware error, which adhere
to a predefined priority as shown in Figure 8-1. They
are intended to provide the user a means to correct
erroneous operation during debug and when operating
within the application.
Note that many of these trap conditions can only be
detected when they occur. Consequently, the question-
able instruction is allowed to complete prior to trap
exception processing. If the user chooses to recover
from the error, the result of the erroneous action that
caused the trap may have to be corrected.
There are 8 fixed priority levels for traps: Level 8
through Level 15, which means that the IPL3 is always
set during processing of a trap.
If the user is not currently executing a trap, and he sets
the IPL<3:0> bits to a value of ‘0111’ (Level 7), then all
interrupts are disabled, but traps can still be processed.
8.3.1
TRAP SOURCES
The following traps are provided with increasing prior-
ity. However, since all traps can be nested, priority has
little effect.
Math Error Trap:
The
math
error
trap
executes
under
these
circumstances:
1.
Should an attempt be made to divide by zero,
the divide operation aborts on a cycle boundary
and the trap is taken.
2.
If enabled, a math error trap is taken when an
arithmetic operation on either accumulator A or
B causes an overflow from bit 31 and the
accumulator guard bits are not utilized.
3.
If enabled, a math error trap is taken when an
arithmetic operation on either accumulator A or
B causes a catastrophic overflow from bit 39 and
all saturation is disabled.
4.
If the shift amount specified in a shift instruction
is greater than the maximum allowed shift
amount, a trap occurs.
Address Error Trap:
This trap is initiated when any of the following
circumstances occurs:
1.
A misaligned data word access is attempted.
2.
A data fetch from our unimplemented data
memory location is attempted.
3.
A data access of an unimplemented program
memory location is attempted.
4.
An instruction fetch from vector space is
attempted.
5.
Execution of a “BRA #literal” instruction or a
“GOTO #literal” instruction, where literal
is an unimplemented program memory address.
6.
Executing instructions after modifying the PC to
point
to
unimplemented
program
memory
addresses. The PC may be modified by loading
a value into the stack and executing a RETURN
instruction.
Stack Error Trap:
This trap is initiated under the following conditions:
1.
The Stack Pointer is loaded with a value which
is greater than the (user-programmable) limit
value written into the SPLIM register (stack
overflow).
2.
The Stack Pointer is loaded with a value which
is less than 0x0800 (simple stack underflow).
Oscillator Fail Trap:
This trap is initiated if the external oscillator fails and
operation becomes reliant on an internal RC backup.
8.3.2
HARD AND SOFT TRAPS
It is possible that multiple traps can become active
within the same cycle (e.g., a misaligned word stack
write to an overflowed address). In such a case, the
fixed priority shown in Figure 8-2 is implemented,
which may require the user to check if other traps are
pending, in order to completely correct the Fault.
‘Soft’ traps include exceptions of priority Level 8
through Level 11, inclusive. The arithmetic error trap
(Level 11) falls into this category of traps.
‘Hard’ traps include exceptions of priority Level 12
through Level 15, inclusive. The address error
(Level 12), stack error (Level 13) and oscillator error
(Level 14) traps fall into this category.
Note:
If the user does not intend to take correc-
tive action in the event of a trap error
condition, these vectors must be loaded
with the address of a default handler that
simply contains the RESET instruction. If,
on the other hand, one of the vectors
containing an invalid address is called, an
address error trap is generated.
Note:
In the MAC class of instructions, wherein
the data space is split into X and Y data
space, unimplemented X space includes
all of Y space, and unimplemented Y
space includes all of X space.
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