System Integration Unit (SIU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
6-14
Freescale Semiconductor
Except for a POR request or writing a 1 to the software external reset flag (SERF) bit, all reset requests,
regardless of priority are not serviced until the current reset completes.
In the following cases, more than one reset bit is set in the reset status register (SIU_RSR):
29–30
BOOTCFG
Reset configuration pin status.
BOOTCFG[0:1] identifies the address of the reset configuration halfword (RCHW) and whether arbitration is used
by the boot assist module (BAM).
00
Internal boot mode – lowest address (0x0000_0000) from one of the six LAS fields in internal flash memory.
01
Serial boot mode – lower halfword of the censorship control word.
10
External boot mode – lowest address (0x0000_0000) of external memory as defined by the
chip select 0 (CS[0]) signal with no external arbitration.
11
Invalid value.
If RSTCFG does not assert before RSTOUT negates, and the lower half of the censorship control word (least
significant halfword) equals 0xFFFF or 0x0000, the BOOTCFG field is set to 0b10.
Otherwise, if the RSTCFG pin was negated at the last negation of RSTOUT, and the lower half of the censorship
control word does not equal 0xFFFF or 0x0000, then the BOOTCFG field is set to the value 0b00.
Refer to
for a description of RCHW.
31
RGF
Reset glitch flag.
Set by the reset controller when a glitch is detected on the RESET pin. This bit is cleared by the assertion of the
power-on reset input to the reset controller, or a write of 1 to the RGF bit. Refer to
,” for more information on glitch detection.
0
No glitch has been detected on the RESET pin.
1
A glitch has been detected on the RESET pin.
Table 6-9. Causes That Set Multiple Reset Status Bits
Case 1
Condition
• POR request negates and the device remains in the reset
• External reset requested
• POR and external reset status bits are set
Reason
POR request started the reset sequence, but an external reset request was received before the POR reset
sequence ended.
Case 2
Condition
• Software external reset requested
• SERF flag bit set but no previously set bits in the SIU_RSR are cleared
Reason
The SERF flag bit is cleared by writing a 1 (write 1 to clear) to the bit location or when another reset source
is asserted.
Table 6-8. SIU_RSR Field Descriptions (continued)
Field
Description
Содержание MPC5565
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