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Signal Descriptions
Interrupt and Mode Control
2.5
INTERRUPT AND MODE CONTROL
Signal Name
Type
MODA/IRQA
Input Input
MODB/IRQB
Input Input
2-8
Table 2-5 Interrupt and Mode Control
State During
Reset
Mode Select A/External Interrupt Request A—This
input has two functions:
1.
2.
MODA is read and internally latched in the DSP when the
processor exits the Reset state. MODA, MODB, and
MODC select the initial chip operating mode. Several
clock cycles (depending on PLL stabilization time) after
leaving the Reset state, the MODA signal changes to
external interrupt request IRQA. The chip operating
mode can be changed by software after reset. The IRQA
input is a synchronized external interrupt request that
indicates that an external device is requesting service. It
may be programmed to be level-sensitive or
negative-edge-sensitive. If the processor is in the Stop
state and IRQA is asserted, the processor will exit the Stop
state.
Mode Select B/External Interrupt Request B—This input
has two functions:
1.
2.
MODB is read and internally latched in the DSP when the
processor exits the Reset state. MODA, MODB, and
MODC select the initial chip operating mode. Several
clock cycles (depending on PLL stabilization time) after
leaving the Reset state, the MODB signal changes to
external interrupt request IRQB. After reset, the chip
operating mode can be changed by software. The IRQB
input is an external interrupt request that indicates that
an external device is requesting service. It may be
programmed to be level-sensitive or
negative-edge-triggered.
DSP56012 User's Manual
Signal Description
to select the initial chip operating mode, and
after synchronization, to allow an external device
to request a DSP interrupt.
to select the initial chip operating mode, and
after internal synchronization, to allow an
external device to request a DSP interrupt.
MOTOROLA
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