Motorola DSP56309 User Manual page 62

Table 2-9 Interrupt and Mode Control (Continued)
Signal Name
MODB Input
IRQB
MODC Input
IRQC
MOTOROLA
State
Type During
Reset
Input Mode Select BÑMODB is an active-low
Schmitt-trigger input, internally synchronized to
CLKOUT. MODA, MODB, MODC, and MODD
select one of 16 initial chip operating modes,
latched into OMR when the RESET signal is
deasserted.
External Interrupt Request BÑAfter hardware
reset, this signal becomes a level-sensitive or
negative-edge-triggered, maskable interrupt
request input during normal instruction
processing. If IRQB is asserted synchronous to
CLKOUT, multiple processors can be
resynchronized using the WAIT instruction and
asserting IRQB to exit the wait state.
Input Mode Select CÑMODC is an active-low
Schmitt-trigger input, internally synchronized to
CLKOUT. MODA, MODB, MODC, and MODD
select one of 16 initial chip operating modes,
latched into OMR when the RESET signal is
deasserted.
External Interrupt Request CÑAfter hardware
reset, this signal becomes a level-sensitive or
negative-edge-triggered, maskable interrupt
request input during normal instruction
processing. If IRQC is asserted synchronous to
CLKOUT, multiple processors can be
resynchronized using the WAIT instruction and
asserting IRQC to exit the wait state.
DSP56309UM/D
Signal/Connection Descriptions
Interrupt and Mode Control
Signal Description
2-15