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型号： MC56F8323VFBE
厂商： Freescale Semiconductor
文件页数： 94/140页
文件大小： 0K
描述： IC MPU HYBRID DSP 32K 64-LQFP
标准包装： 160
系列： 56F8xxx
核心处理器： 56800E
芯体尺寸： 16-位
速度： 60MHz
连通性： CAN，SCI，SPI
外围设备： POR，PWM，温度传感器，WDT
输入/输出数： 27
程序存储器容量： 32KB（16K x 16）
程序存储器类型： 闪存
RAM 容量： 12K x 8
电压 - 电源 (Vcc/Vdd)： 2.25 V ~ 3.6 V
数据转换器： A/D 8x12b
振荡器型： 内部
工作温度： -40°C ~ 105°C
封装/外壳： 64-LQFP
包装： 托盘
配用： MC56F8323EVME-ND - BOARD EVALUATION MC56F8323
Introduction
56F8323 Technical Data, Rev. 17
Freescale Semiconductor
57
Preliminary
Part 5 Interrupt Controller (ITCN)
5.1 Introduction
The Interrupt Controller (ITCN) module is used to arbitrate between various interrupt requests (IRQs), to
signal to the 56800E core when an interrupt of sufficient priority exists, and to what address to jump in
order to service this interrupt.
5.2 Features
The ITCN module design includes these distinctive features:
Programmable priority levels for each IRQ
Two programmable Fast Interrupts
Notification to SIM module to restart clocks out of Wait and Stop modes
Drives initial address on the address bus after reset
For further information, see Table 4-3, Interrupt Vector Table Contents.
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, 0 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.
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
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