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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
4-9
signal (as indicated by assertion of RSTOUT), the value on the WKPCFG pin is applied; at the same time
the PLLCFG[0:1] values are applied if RSTCFG is asserted. After the FMPLL has a clock and is locked,
the reset controller waits the predetermined clock cycles (See
Section 4.2.2, “Reset Output (RSTOUT)
”)
before negating RSTOUT. When the clock count finishes the WKPCFG and BOOTCFG[0:1] pins are
sampled (note that the BOOTCFG[0:1] pins are only sampled if RSTCFG is asserted). The reset controller
then waits 4 clock cycles before the negating RSTOUT, and the associated bits/fields are updated in the
SIU_RSR. In addition, the LCRS bit is set, and all other reset status bits in the SIU_RSR are cleared. Refer
to
Section 11.4.2.6, “Loss-of-Clock Detection
,”
for more information on loss-of-clock.
4.4.2.3.5
Watchdog Timer/Debug Reset
A watchdog timer reset occurs when the e200z6 core watchdog timer is enabled, and a time-out occurs
with the enable next watchdog timer (EWT) and watchdog timer interrupt status (WIS) bits set in the timer
status register (TSR), and with the watchdog reset control (WRC) field in the timer control register (TCR)
configured for a reset. The WDRS bit in the SIU_RSR is also set when a debug reset command is issued
from a debug tool. To determine whether the WDRS bit was set due to a watchdog timer or debug reset,
check the WRS field in the e200z6 core TSR. The effect of a watchdog timer or debug reset request is the
same for the reset controller. Starting at the assertion of the internal reset signal (as indicated by assertion
of RSTOUT), the value on the WKPCFG pin is applied; at the same time the PLLCFG[0:1] values are
applied if RSTCFG is asserted. After the FMPLL is locked, the reset controller waits the predetermined
number of clock cycles (See
Section 4.2.2, “Reset Output (RSTOUT)
”) before negating RSTOUT. When
the clock count finishes the WKPCFG and BOOTCFG[0:1] pins are sampled (note that the
BOOTCFG[0:1] pins are only sampled if RSTCFG is asserted). The reset controller then waits 4 clock
cycles before the negating RSTOUT, and the associated bits/fields are updated in the SIU_RSR. In
addition, the WTRS bit is set, and all other reset status bits in the SIU_RSR are cleared. Refer to the e200z6
Core Guide for more information on the watchdog timer and debug operation.
4.4.2.3.6
Checkstop Reset
When the e200z6 core enters a checkstop state, and the checkstop reset is enabled (the CRE bit in the
system reset control register (SIU_SRCR) is set), a checkstop reset occurs. Starting at the assertion of the
internal reset signal (as indicated by assertion of RSTOUT), the value on the WKPCFG pin is applied; at
the same time the PLLCFG[0:1] values are applied if RSTCFG is asserted. After the FMPLL is locked,
the reset controller waits a predetermined number of clock cycles (See
”) before negating RSTOUT. When the clock count finishes the WKPCFG and
BOOTCFG[0:1] pins are sampled (note that the BOOTCFG[0:1] pins are only sampled if RSTCFG is
asserted). The reset controller then waits 4 clock cycles before the negating RSTOUT, and the associated
bits/fields are updated in the SIU_RSR. In addition, the CRS bit is set, and all other reset status bits in the
SIU_RSR are cleared. Refer to e200z6 Core Guide for more information.
4.4.2.3.7
JTAG Reset
A system reset occurs when JTAG is enabled and either the EXTEST, CLAMP, or HIGHZ instructions are
executed by the JTAG controller. Starting at the assertion of the internal reset signal (as indicated by
assertion of RSTOUT), the value on the WKPCFG pin is applied; at the same time the PLLCFG[0:1]
values are applied if RSTCFG is asserted.
After the JTAG reset request has negated and the FMPLL is locked, the reset controller waits a
predetermined number of clock cycles (See
Section 4.2.2, “Reset Output (RSTOUT)
”) before negating
RSTOUT. When the clock count finishes the WKPCFG and BOOTCFG[0:1] pins are sampled (note that
the BOOTCFG[0:1] pins are only sampled if RSTCFG is asserted), and their associated bits/fields are
updated in the SIU_RSR. The reset source status bits in the SIU_RSR are unaffected. Refer to
“IEEE 1149.1 Test Access Port Controller (JTAGC)
for more information.
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