Reset - Motorola MPC823e Reference Manual

SECTION 4

RESET

The reset block of the MPC823e has a reset control logic that determines the cause of reset,
synchronizes it if necessary, and resets the appropriate logic modules. The memory
controller, system protection logic, interrupt controller, and parallel I/O pins are initialized
only on hard reset. Soft reset initializes the internal logic while maintaining the system
configuration.
RESET
RESET
LOGIC
SOURCE
AND PLL
STATE
RESET
Power-On Reset
External Hard Reset
Loss-of-Lock
Software Watchdog
Check Stop
Debug Port Hard Reset
JTAG Reset
External Soft Reset
Debug Port Soft Reset
NOTE: √ indicates that the logic circuitry is reset or the appropriate pin is driven by the source.
— indicates that the logic circuitry is not affected.
MOTOROLA
Table 4-1. Possible Reset Results
RESET EFFECT
SYSTEM CLOCK
CONFIG MODULE
RESET RESET
√ √ √
√ √
—
√
— —
MPC823e REFERENCE MANUAL
HRESET
DEBUG OTHER
PIN PORT INTERNAL
DRIVEN CONFIG LOGIC
RESET
√ √ √
√ √ √
√ √
—
SRESET
PIN
DRIVEN
√
√
√
4-1