Datasheet

MPC5200B Data Sheet, Rev. 4

Freescale Semiconductor 15

For additional information, see the MPC5200B User’s Manual (MPC5200BUM).

1.3.4.1 Reset Configuration Word

During reset (HRESET and PORRESET) the Reset Configuration Word is latched in the related Reset Configuration Word

and PORRESET) are inactive (high), the

contents of this register are locked immediately with the SYS_XTAL clock (see Figure 3).

Figure 3. Reset Configuration Word Locking

NOTE

Beware of changing the values on the pins of the reset configuration word after the

deassertion of PORRESET

. This may cause problems because it may change the internal

clock ratios and so extend the PLL locking process.

1.3.5 External Interrupts

The MPC5200B provides three different kinds of external interrupts:

• Four IRQ interrupts

• Eight GPIO interrupts with simple interrupt capability (not available in power-down mode)

• Eight WakeUp interrupts (special GPIO pins)

The propagation of these three kinds of interrupts to the core is shown in the following graphic:

sample

sample sample

sample

LOCK

RST_CFG_WRD

HRESET

PORRESET

SYS_XTAL

4096 clocks