參數資料
型號: XE8000EV108
廠商: Semtech
文件頁數: 95/143頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XE8806/XE8807
標準包裝: 1
類型: MCU
適用于相關產品: XE88LC06AMI026
所含物品: 完全組裝的評估板
產品目錄頁面: 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
8-5
XE8806A/XE8807A
Once memorized, an interrupt flag can be cleared by writing a ‘1’ in the corresponding bit of RegIrqHig, RegIrqMid
or RegIrqLow. Writing a ‘0’ does not modify the flag. To definitively clear the interrupt, one has to clear the
CoolRISC interrupt in the CoolRISC stat register. All interrupts are automatically cleared after a reset.
Two registers are provided to facilitate the writing of interrupt service software. RegIrqPriority contains the number
of the highest priority set (its value is 0xFF when no interrupt is memorized). RegIrqIrq indicates the priority level of
the currently activated interrupts.
All interrupt sources are sampled by the highest frequency in the system. A CPU interruption is generated and
memorized when an interrupt becomes high. Between the rising edge of the interrupt on the peripheral and the
rising edge on the CoolRISC core, there is a latency of one clock cycle.
IE2
IE1
GIE
IN2
IN1
IN0
EV1
EV0
stat
low
p
ri
o
ri
ty
PC
=
h
0
002
medi
um
p
ri
o
ri
ty
PC
=
h
0
001
high
p
ri
o
rit
y
PC
=
h
0
003
7
6
5
4
3
2
1
0
RegIrqHig
RegIrqLow
RegIrqMid
7
6
5
4
3
2
1
0
RegIrqEnHig
in
te
rr
u
p
tso
urc
es
Figure 8-1. Principle of the interrupt handler.
8.5
Interrupt handling software
This chapter describes an example of the software used for the interrupt handler. This software is present by
default in the software development environments. It represents only one of several possible ways of handling the
interrupts.
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