Reset And Reset Configuration; Reset Button; Hard Reset Configuration - Motorola EVB555 Quick Reference

4.6 Reset and Reset Configuration

4.6.1 Reset Button

The Reset (SW702) button initiates a hard reset of the MPC555. When a hard reset
occurs, the MPC555 terminates the current program and enters the reset state. The
PLL continues to run, however. Once the button is released, the MPC555 starts to
work again by reading the system configuration (hard reset configuration).

4.6.2 Hard Reset Configuration

The hard reset configuration makes it possible to influence the behavior of the
MPC555 from outside. It particularly includes settings that are necessary before or
during the start of the first program. The reset configuration is read by the MPC555
after the supply voltage is switched on and after a hard reset has occurred.
Setting the hard reset configuration is conveniently solved on the EVB555 by assign-
ing the hard reset configuration word via 32 DIP switches.
Table 4-1 on the following page is a short summary of the meaning of the individual
bits. For a more detailed description, please consult the MPC555 User Manual. The
specified variant makes it possible to work with a BDM debugger.
EVB555
Quick Reference
MOTOROLA
4-19