参数资料
型号: EVAL-ADUC7124QSPZ
厂商: Analog Devices Inc
文件页数: 30/108页
文件大小: 0K
描述: BOARD EVALUATION FOR ADUC7124
设计资源: EVAL-ADUC7124 Schematic
ADUC7124 Eval Brd Gerber Files
标准包装: 1
系列: MicroConverter® ADuC7xxx
类型: MCU
适用于相关产品: ADUC7124
所含物品:
ADuC7124/ADuC7126
Data Sheet
Rev. C | Page 28 of 108
More information relative to the model of the programmer and
the ARM7TDMI core architecture can be found in the
following materials from ARM:
DDI0029G, ARM7TDMI Technical Reference Manual
DDI-0100, ARM Architecture Reference Manual
INTERRUPT LATENCY
The worst-case latency for a fast interrupt request (FIQ)
consists of the following:
The longest time the request can take to pass through the
synchronizer
The time for the longest instruction to complete (the
longest instruction is an LDM) that loads all the registers
including the PC
The time for the data abort entry
The time for the FIQ entry
At the end of this time, the ARM7TDMI executes the instruction
at 0x1C (FIQ interrupt vector address). The maximum total
time is 50 processor cycles, which is just under 1.2 μs in a
system using a continuous 41.78 MHz processor clock.
The maximum interrupt request (IRQ) latency calculation is
similar but must allow for the fact that FIQ has higher priority
and can delay entry into the IRQ handling routine for an
arbitrary length of time. This time can be reduced to 42 cycles if
the LDM command is not used. Some compilers have an option
to compile without using this command. Another option is to run
the part in Thumb mode where the time is reduced to 22 cycles.
The minimum latency for FIQ or IRQ interrupts is a total of
five cycles, which consist of the shortest time the request can
take through the synchronizer plus the time to enter the
exception mode.
Note that the ARM7TDMI always runs in ARM (32-bit) mode
when in privileged modes, for example, when executing interrupt
service routines.
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