参数资料
型号: MC56F8036VLF
厂商: Freescale Semiconductor
文件页数: 118/164页
文件大小: 0K
描述: IC DGTL SGNL CTLR 16BIT 48-LQFP
标准包装: 1,250
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 32MHz
连通性: CAN,I²C,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 39
程序存储器容量: 64KB(32K x 16)
程序存储器类型: 闪存
RAM 容量: 4K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 10x12b; D/A 2x12b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 48-LQFP
包装: 托盘
产品目录页面: 734 (CN2011-ZH PDF)
Functional Description
56F8036 Data Sheet, Rev. 6
Freescale Semiconductor
57
5.3.1
Normal Interrupt Handling
Once the INTC 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 Vector Base
Address (VBA) and the vector number to determine the vector address, generating an offset 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 56800E core controls the masking of interrupt priority levels it will accept by setting the I0
and I1 bits in its status register.
The IPIC bits of the ICTRL register reflect the state of the priority level being presented to the 56800E
core.
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:
1. Setting the priority of the interrupt as level 2, with the appropriate field in the IPR registers
2. Setting the FIMn register to the appropriate vector number
3. Setting the FIVALn and FIVAHn registers with the address of the code for the
Fast Interrupt
Table 5-1 Interrupt Mask Bit Definition
SR[9] (I1)
SR[8] (I0)
Exceptions Permitted
Exceptions Masked
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_VALUE[1:0]
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
Priority 2 or 3
Priority 3
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