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參數(shù)資料
| 型號： | XCA56011BU95 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 24-BIT DVD DIGITAL SIGNAL PROCESSOR |
| 中文描述： | 8-BIT, 95 MHz, OTHER DSP, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 12/82頁 |
| 文件大小： | 318K |
| 代理商： | XCA56011BU95 |
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Preliminary Information
1-6
DSP56011 Technical Data Sheet, Rev. 1
MOTOROLA
Signal/Connection Descriptions
Interrupt and Mode Control
PRELIMINARY
INTERRUPT AND MODE CONTROL
Table 1-5
Interrupt and Mode Control
Signal
Name
Type
State During
Reset
Signal Description
MODA
IRQA
Input
Input
Input (MODA)
Mode Select A
—This input signal has three functions:
to work with the MODB and MODC signals to
select the DSP’s initial operating mode,
to allow an external device to request a DSP
interrupt after internal synchronization, and
to turn on the internal clock generator when the
DSP is in the Stop processing state, causing the DSP
to resume processing.
MODA is read and internally latched in the DSP when the
processor exits the Reset state. The logic state present on the
MODA, MODB, and MODC pins selects the initial DSP
operating mode. Several clock cycles after leaving the Reset
state, the MODA signal changes to the external interrupt
request IRQA. The DSP operating mode can be changed by
software after reset.
External Interrupt Request A (IRQA)
—The IRQA input is a
synchronized external interrupt request. It may be
programmed to be level-sensitive or negative-edge
triggered. When the signal is edge-triggered, triggering
occurs at a voltage level and is not directly related to the fall
time of the interrupt signal. However, as the fall time of the
interrupt signal increases, the probability that noise on
IRQA will generate multiple interrupts also increases.
While the DSP is in the Stop mode, asserting IRQA gates on
the oscillator and, after a clock stabilization delay, enables
clocks to the processor and peripherals. Hardware reset
causes this input to function as MODA.
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