Reset
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
4-5
4.3.1.2
System Reset Control Register (SIU_SRCR)
The system reset control register (SIU_SRCR) allows software to generate either a software system reset
or software external reset. The software system reset causes an internal reset sequence, while the software
external reset only asserts the external RSTOUT signal. When written to 1, the SER bit automatically
clears after a predetermined number of clock cycles. If the value of the SER bit is 1 and a 0 is written to
the bit, the bit is cleared and RSTOUT negates, regardless of the number of clocks that have expired.
Refer to
Section 4.2.2, “Reset Output (RSTOUT)
The CRE bit in the SIU_SRCR allows software to enable a checkstop reset. If enabled, a checkstop reset
occurs if the checkstop reset input to the reset controller is asserted. The checkstop reset is enabled by
default.
15
SERF
Software external reset flag
0 No software external reset occurred.
1 A software external reset occurred.
16
WKPCFG
Weak pull configuration pin status
0 WKPCFG pin latched during the last reset was logic 0 and weak pulldown is the default setting.
1 WKPCFG pin latched during the last reset was logic 1 and weak pullup is the default setting.
17–28
Reserved.
29–30
BOOTCFG
Reset configuration pin status. Holds the value of the BOOTCFG[0:1] pins that was latched four clocks before
the last negation of the RSTOUT pin, if the RSTCFG pin was asserted. If the RSTCFG pin was negated at
the last negation of RSTOUT, the BOOTCFG field is set to the value 0b00. The BOOTCFG field is used by
the BAM program to determine the location of the reset configuration halfword (RCHW). Refer to
for the RCHW location from the BOOTCFG field value.
31
RGF
RESET glitch flag. Set by the MCU when RESET asserts for more than 2 clocks clock cycles, but less than
the minimum RESET assertion time of 10 consecutive clocks to cause a reset. This bit is cleared by the reset
controller for a valid assertion of the RESET pin or a power-on reset or a write of 1 to the bit.
0 No glitch was detected on the RESET pin.
1 A glitch was detected on the RESET pin.
Address: Base + 0x0010
Access: R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
SSR SER
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CRE
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1
The CRE bit is reset to 1 by POR. Other resets sources do not reset the bit value.
Figure 4-2. System Reset Control Register (SIU_SRCR)
Table 4-2. SIU_RSR Field Descriptions (continued)
Field
Description
Содержание MPC5565
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