dsp56167 Freescale Semiconductor, Inc, dsp56167 Datasheet - Page 25

• Manufacturer Part Number: dsp56167
• Description: Advance Information 16-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
Signal Name
DR
Table 1-14 On-Chip Emulation (OnCE) Port Signals (Continued)
Signal
Input
Type
during
Reset
Input
State
Debug Request—The debug request input (DR) allows the user
to enter the Debug mode of operation from the external
command controller. When DR is asserted, it causes the DSP to
finish the current instruction being executed, save the instruction
pipeline information, enter the Debug mode, and wait for
commands to be entered from the DSI line. While in Debug
mode, the DR signal lets the user reset the OnCE controller by
asserting it and deasserting it after receiving acknowledge. It
may be necessary to reset the OnCE controller in cases where
synchronization between the OnCE controller and external
circuitry is lost. DR must be deasserted after the OnCE port
responds with an acknowledge on the DSO signal and before
sending the first OnCE command. Asserting DR will cause the
chip to exit the Stop or Wait state. Having DR asserted during
the deassertion of RESET will cause the DSP to enter Debug
mode.
DSP56167/D, Rev. 1
Signal Description
On-Chip Emulation Port
Signal/Pin Descriptions
1-19