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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
245 of 1441
NXP Semiconductors
UM10503
Chapter 15: LPC43xx/LPC43Sxx Reset Generation Unit (RGU)
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. All 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
to
).
15.4.4.1 Reset external status register 1 for PERIPH_RST
This register shows whether or not the CORE_RST output has activated the
PERIPH_RST. A reset generated from the CORE_RST is the only possible reset source
for the PERIPH_RST aside from a software reset by writing to the RESET_CTRL register.
15.4.4.2 Reset external status register 2 for MASTER_RST
15.4.4.3 Reset external status register 5 for CREG_RST
Table 180. Reset external status register 1 (RESET_EXT_STAT1, address 0x4005 3404) bit
description
Bit
Symbol
Description
Reset
value
Access
0
-
Reserved. Do not modify; read as logic 0.
0
-
1
CORE_RESET Reset activated by CORE_RST output. Write 0 to
clear.
0 = Reset not activated
1 = Reset activated
0
R/W
31:2
-
Reserved. Do not modify; read as logic 0.
0
-
Table 181. Reset external status register 2 (RESET_EXT_STAT2, address 0x4005 3408) bit
description
Bit
Symbol
Description
Reset
value
Access
1:0
-
Reserved. Do not modify; read as logic 0.
0
-
2
PERIPHERAL_RESET Reset activated by PERIPHERAL_RST
output. Write 0 to clear.
0 = Reset not activated
1 = Reset activated
1
R/W
31:3
-
Reserved. Do not modify; read as logic 0.
0
-
Table 182. Reset external status register 5 (RESET_EXT_STAT5, address 0x4005 3414) bit
description
Bit
Symbol
Description
Reset
value
Access
0
-
Reserved. Do not modify; read as logic 0.
0
-
1
CORE_RESET
Reset activated by CORE_RST output. Write
0 to clear.
0 = Reset not activated
1 = Reset activated
0
R/W
31:2
-
Reserved. Do not modify; read as logic 0.
0
-