參數(shù)資料
型號： MC56F8346VFVE
廠商： Freescale Semiconductor
文件頁數(shù)： 158/178頁
文件大?。?/td> 0K
描述： IC DSP 16BIT 60MHZ 144-LQFP
標準包裝： 60
系列： 56F8xxx
核心處理器： 56800E
芯體尺寸： 16-位
速度： 60MHz
連通性： CAN，EBI/EMI，SCI，SPI
外圍設(shè)備： POR，PWM，溫度傳感器，WDT
輸入/輸出數(shù)： 62
程序存儲器容量： 136KB（68K x 16）
程序存儲器類型： 閃存
RAM 容量： 6K x 16
電壓 - 電源 (Vcc/Vdd)： 2.25 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x12b
振蕩器型： 外部
工作溫度： -40°C ~ 105°C
封裝/外殼： 144-LQFP
包裝： 托盤
配用： MC56F8367EVME-ND - EVAL BOARD FOR MC56F83X
56F8346 Technical Data, Rev. 15
80
Freescale Semiconductor
Preliminary
5.3 Functional Description
The Interrupt Controller is a slave on the IPBus. It contains registers allowing each of the 82 interrupt
sources to be set to one of four priority levels, excluding certain interrupts of fixed priority. Next, all of
the interrupt requests of a given level are priority encoded to determine the lowest numerical value of the
active interrupt requests for that level. Within a given priority level, zero is the highest priority, while
number 81 is the lowest.
5.3.1
Normal Interrupt Handling
Once the ITCN has determined that an interrupt is to be serviced and which interrupt has the highest
priority, an interrupt vector address is generated. Normal interrupt handling concatenates the VBA and the
vector number to determine the vector address. In this way, an offset is generated into the vector table for
each interrupt.
5.3.2
Interrupt Nesting
Interrupt exceptions may be nested to allow an IRQ of higher priority than the current exception to be
serviced. The following tables define the nesting requirements for each priority level.
5.3.3
Fast Interrupt Handling
Fast interrupts are described in the DSP56800E Reference Manual. The interrupt controller recognizes
fast interrupts before the core does.
A fast interrupt is defined (to the ITCN) by:
Table 5-1 Interrupt Mask Bit Definition
SR[9]1
1. Core status register bits indicating current interrupt mask within the core.
SR[8]1
Permitted Exceptions
Masked Exceptions
0
Priorities 0, 1, 2, 3
None
0
1
Priorities 1, 2, 3
Priority 0
1
0
Priorities 2, 3
Priorities 0, 1
1
Priority 3
Priorities 0, 1, 2
Table 5-2 Interrupt Priority Encoding
IPIC_LEVEL[1:0]1
1. See IPIC field definition in Part 5.6.30.2.
Current Interrupt
Priority Level
Required Nested
Exception Priority
00
No Interrupt or SWILP
Priorities 0, 1, 2, 3
01
Priority 0
Priorities 1, 2, 3
10
Priority 1
Priorities 2, 3
11
Priorities 2 or 3
Priority 3
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