UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
172 of 1269
NXP Semiconductors
UM10503
Chapter 13: LPC43xx Reset Generation Unit (RGU)
13.4.4 Reset external status registers
The external status registers indicate which input to the reset generator caused the reset
output to go active. Any bit set to 1 in the Reset external status register should be cleared
to 0 after a read operation to allow the detection of the next reset.
All reset generators except the WWDT time-out reset, the BOD reset, the reset signal
from the PMU, and the software reset, which have no inputs, have an associated external
status register. The CORE_RST reset generator has three possible inputs (the WWDT
time-out reset, the BOD reset, and the PMU), and which input caused the reset is
indicated in the external status register. All other reset generators have only one input
which, depending on the hierarchy, can be either the CORE_RST, the
PERIPHERAL_RST, or the MASTER_RST.
Note that the external status register does not show whether or not the reset was
activated by a software reset. The software reset is indicated in the reset status registers 0
to 3 (see
20
I2S_RST
Current status of the I2S_RST
0 = Reset asserted
1 = No reset
0
R
21
SPIFI_RST
Current status of the SPIFI_RST
0 = Reset asserted
1 = No reset
0
R
22
CAN1_RST
Current status of the CAN1_RST
0 = Reset asserted
1 = No reset
0
R
23
CAN0_RST
Current status of the CAN0_RST
0 = Reset asserted
1 = No reset
0
R
24
M0APP_RST
Current status of the M0APP_RST
0 = Reset asserted
1 = No reset
0
R
25
SGPIO_RST
Current status of the SGPIO_RST
0 = Reset asserted
1 = No reset
0
R
26
SPI_RST
Current status of the SPI_RST
0 = Reset asserted
1 = No reset
0
R
27
-
Reserved.
-
-
28
-
Reserved.
-
-
29
-
Reserved.
-
-
30
-
Reserved.
-
-
31
-
Reserved.
-
-
Table 121. Reset active status register 1 (RESET_ACTIVE_STATUS1, address 0x4005 3154)
bit description
…continued
Bit
Symbol
Description
Reset
value
Access