參數(shù)資料
型號： MC56F8157
廠商： Electronic Theatre Controls, Inc.
英文描述： 16-BIT HYBRID CONTROLLERS
中文描述： 16位混合控制器
文件頁數(shù)： 76/172頁
文件大小： 2444K
代理商： MC56F8157
56F8357 Technical Data, Rev. 8.0
76
Freescale Semiconductor
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
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
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.
Normal Interrupt Handling
5.3.2
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.
Interrupt Nesting
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
0
Priorities 0, 1, 2, 3
None
0
1
Priorities 1, 2, 3
Priority 0
1
0
Priorities 2, 3
Priorities 0, 1
1
1
Priority 3
Priorities 0, 1, 2
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