參數(shù)資料
型號： DSPB56007FJ50
英文描述： DSP|24-BIT|CMOS|QFP|80PIN|PLASTIC
中文描述： 數(shù)字信號處理器| 24位|的CMOS | QFP封裝| 80腳|塑料
文件頁數(shù)： 14/83頁
文件大?。?/td> 382K
代理商： DSPB56007FJ50
1-8
DSP56007/D
MOTOROLA
Signal/Connection Descriptions
Interrupt and Mode Control
MODB
IRQB
Input
Input (MODB)
Mode Select B
—This input signal has two functions:
to work with the MODA and MODC signals to select
the DSP’s initial operating mode, and
to allow an external device to request a DSP
interrupt after internal synchronization.
MODB 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 MODB signal changes to the external interrupt
request IRQB. The DSP operating mode can be changed by
software after reset.
External Interrupt Request
B (IRQB
)—The IRQB 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 IRQB
will generate multiple interrupts also increases. Hardware
reset causes this input to function as MODB.
Table 1-7
Interrupt and Mode Control Signals (Continued)
Signal Name
Signal
Type
State during
Reset
Signal Description
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