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UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
152 of 1269
13.1 How to read this chapter
Flash/EEPROM, Ethernet, USB0, USB1, and LCD related resets are not available on all
packages or parts. See
. The corresponding reset registers are reserved.
13.2 Basic configuration
The RGU is reset by a BUS_RST (reset #8).
13.3 General description
The RGU allows generation of independent reset signals for various blocks and
peripherals on the LPC43xx. Each reset signal is asserted by a reset generator with one
output (the reset signal) and one or more inputs, which link the reset generators together
and create a reset hierarchy.
Remark:
The ARM Cortex-M4 SYSRESETREQ triggers a peripheral reset PERIPH_RST.
UM10503
Chapter 13: LPC43xx Reset Generation Unit (RGU)
Rev. 1.3 — 6 July 2012
User manual
Table 110. RGU clocking and power control
Base clock
Branch clock
Operating
frequency
RGU
BASE_M4_CLK
CLK_M4_BUS
up to 204 MHz
RGU delay clocks
BASE_SAFE_CLK
-
12 MHz
Fig 30. RGU Block diagram
24
RGU
RESET
BOD reset
WWDT reset
CORE_RST
GENERATOR
PERIPH_RST
GENERATOR
MASTER_RST
GENERATOR
WWDT
APB peripherals, GPIO
Bus bridges,
memory controllers
AHB peripherals (USB0/1, LCD,
Ethernet, GPDMA, SDIO)
Cortex-M4 core
CREG; RTC domain peripherals; PMC
6