Motorola MPC533 Reference Manual page 271

Table 7-3. Reset Status Register Bit Descriptions (continued)
Bits Name
10 GPOR Glitch detected on PORESET pin. This bit is set when the PORESET pin is asserted for more
than 20ns
0 No glitch was detected on the PORESET pin
1 A glitch was detected on the PORESET pin
11 GHRST Glitch detected on HRESET pin. This bit is set when the HRESET pin is asserted for more than
20ns
0 No glitch was detected on the HRESET pin
1 A glitch was detected on the HRESET pin
12 GSRST Glitch detected on SRESET pin. If the SRESET pin is asserted for more than 20ns the GHRST
bit will be set. If an internal or external SRESET is generated the SRESET pin is asserted and
the GSRST bit will be set. The GSRST bit remains set until software clears it. The GSRST bit can
be negated by writing a one to GSRST. A write of zero has no effect on this bit.
0 No glitch was detected on SRESET pin
1 A glitch was detected on SRESET pin
13:15 — Reserved
1
In the USIU RSR, if both EHRS and ESRS are set, the reset source is internal. The EHRS and ESRS bits in RSR
register are set for any internal reset source in addition to external HRESET and external SRESET events. If both
internal and external indicator bits are set, then the reset source is internal.
7.5 Reset Configuration
7.5.1 Hard Reset Configuration
When a hard reset event occurs, the MPC533 reconfigures its hardware system as well as
the development port configuration. The logical value of the bits that determine its initial
mode of operation, are sampled from the following:
• The external data bus pins DATA[0:31]
• An internal default constant (0x0000 0000)
• An internal NVM register value (UC3FCFIG). Available on the only. Refer to
If at the sampling time RSTCONF is asserted, then the configuration is sampled from the
data bus. If RSTCONF is negated and a valid NVM value exists (UC3FCFIG bit HC=0),
then the configuration is sampled from the NVM register in the UC3F module. If
RSTCONF is negated and no valid NVM value exists (UC3FCFIG bit HC=1), then the
configuration word is sampled from the internal default. HC will be "1" if the internal flash
is erased. Table 7-4 summarizes the reset configuration options.
RSTCONF
0
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 7-4. Reset Configuration Options
Has Configuration (HC)
x
Chapter 7. Reset
Description
.
Internal Configuration Word
DATA[0:31] pins
Reset Configuration
7-7