DSP56002RC40 Motorola Inc, DSP56002RC40 Datasheet - Page 16

• Manufacturer Part Number: DSP56002RC40
• Description: 24-BIT DIGITAL SIGNAL PROCESSOR
• Manufacturer: Motorola Inc

Signal/Pin Descriptions
Interrupt and Mode Control
INTERRUPT AND MODE CONTROL
1-10
MODA/IRQA
MODB/IRQB
Signal Name
Signal
Input
Input
Type
Table 1-8 Interrupt and Mode Control Signals
Input
Input
during
Reset
State
Mode Select A/External Interrupt Request A—This input has
two functions:
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 level-sensitive triggering is
selected, an external pull up resistor is required for wired-OR
operation. 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:
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. If level-sensitive triggering is selected, an external
pull up resistor is required for wired-OR operation.
DSP56002/D, Rev. 3
1.
2.
1.
2.
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.
Signal Description
MOTOROLA