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System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
Freescale Semiconductor
6-13
6.3.1.4
External Interrupt Status Register (SIU_EISR)
The SIU_EISR is used to record edge-triggered events on the IRQ[0]–IRQ[15] inputs to the SIU. When
an edge-triggered event is enabled in the SIU_IREER or SIU_IFEER for an IRQ[
n
] input and then sensed,
the corresponding SIU_EISR flag bit is set. The IRQ flag bit is set regardless of the state of the
Address: Base + 0x0010
Access: Read / Write[0:1, 16]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
SER
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
Address: Base + 0x0010
Access: Read / Write[0:1, 16]
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
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
1
The SSR bit always reads as 0. A write of 0 to this bit has no effect.
2
The CRE bit is set to 1 by POR. Other resets sources do not reset the bit value.
Figure 6-5. System Reset Control Register (SIU_SRCR)
Table 6-7. SIU_SRCR Field Descriptions
Register Bit Range
Field Name
Description
0
SSR
Software system reset. Used to generate a software system reset. Writing a 1 to this bit causes an
internal reset. The software system reset is processed as a synchronous reset. The bit is
automatically cleared on the assertion of any other reset source except a software external reset.
0 Do not generate a software system reset.
1 Generate a software system reset.
1
SER
Software external reset. Used to generate a software external reset. Writing a 1 to this bit asserts
RSTOUT for 2400 clocks, but the internal reset is not asserted. The SER bit is automatically cleared
when the software external reset completes, or any other reset source asserts a reset. After an
software external reset is invoked, RSTOUT negates if this bit is cleared before the 2400 clock period
expires.
0 Do not generate a software external reset.
1 Generate a software external reset.
Note: If the PLL is configured for dual controller mode, writing a 1 to SER asserts RSTOUT for 16000
clocks. Refer to
Section 4.2.2, “Reset Output (RSTOUT)
.
2–15
Reserved.
16
CRE
Checkstop reset enable. Writing a 1 to this bit enables a reset when the checkstop reset request input
is asserted. The checkstop reset request input is a synchronous internal reset source. The CRE bit
defaults to checkstop reset enabled at POR. If this bit is cleared, it remains cleared until the next POR.
0 No reset occurs when the checkstop reset input to the reset controller is asserted.
1 A reset occurs when the checkstop reset input to the reset controller is asserted.
17–31
Reserved.
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