Reset - Freescale Semiconductor PowerPC MPC823 Reference Manual

SECTION 4

RESET

The reset block of the MPC823 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
SOURCE
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.
Freescale Semiconductor, Inc.
Table 4-1. Possible Reset Results
RESET SYSTEM CLOCK
LOGIC CONFIG MODULE
AND PLL RESET RESET
STATE
RESET
√ √
√
—
√
—
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RESET EFFECT
HRESET DEBUG
PIN PORT
DRIVEN CONFIG
√ √ √
√ √ √
√
— —
OTHER SRESET
INTERNAL PIN
LOGIC DRIVEN
RESET
√ √
√ √
√ √
4-1