The LPC1759 is a Cortex-M3 microcontroller for embedded applications featuring a high level of integration and low power consumption at frequencies of 120 MHz

LPC1759FBD80

Manufacturer Part NumberLPC1759FBD80
DescriptionThe LPC1759 is a Cortex-M3 microcontroller for embedded applications featuring a high level of integration and low power consumption at frequencies of 120 MHz
ManufacturerNXP Semiconductors
LPC1759FBD80 datasheet
 


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NXP Semiconductors
LPC17xx
MAIN
OSCILLATOR
INTERNAL
RC
OSCILLATOR
32 kHz
RTC
OSCILLATOR
Fig 4.
LPC1759/58/56/54/52/51 clocking generation block diagram
7.29.1.1 Internal RC oscillator
The IRC may be used as the clock source for the WDT, and/or as the clock that drives the
PLL and subsequently the CPU. The nominal IRC frequency is 4 MHz. The IRC is
trimmed to 1 % accuracy over the entire voltage and temperature range.
Upon power-up or any chip reset, the LPC1759/58/56/54/52/51 use the IRC as the clock
source. Software may later switch to one of the other available clock sources.
7.29.1.2 Main oscillator
The main oscillator can be used as the clock source for the CPU, with or without using the
PLL. The main oscillator also provides the clock source for the dedicated USB PLL.
The main oscillator operates at frequencies of 1 MHz to 25 MHz. This frequency can be
boosted to a higher frequency, up to the maximum CPU operating frequency, by the main
PLL. The clock selected as the PLL input is PLLCLKIN. The ARM processor clock
frequency is referred to as CCLK elsewhere in this document. The frequencies of
PLLCLKIN and CCLK are the same value unless the PLL is active and connected. The
clock frequency for each peripheral can be selected individually and is referred to as
PCLK. Refer to
7.29.1.3 RTC oscillator
The RTC oscillator can be used as the clock source for the RTC block, the main PLL,
and/or the CPU.
LPC1759_58_56_54_52_51
Product data sheet
USB PLL
MAIN PLL
system
clock
main PLL enable
select
(CLKSRCSEL)
WATCHDOG
TIMER
pclk
WDT
rtclk = 1Hz
REAL-TIME
CLOCK
Section 7.29.2
for additional information.
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 29 March 2011
LPC1759/58/56/54/52/51
32-bit ARM Cortex-M3 microcontroller
usbclk
(48 MHz)
USB
CLOCK
DIVIDER
pllclk
USB clock config
USB PLL enable
(USBCLKCFG)
cclk
CPU
ARM
CLOCK
CORTEX-M3
DIVIDER
ETHERNET
CPU clock config
BLOCK
(CCLKCFG)
DMA
GPIO
NVIC
CCLK/8
CCLK/6
PERIPHERAL
CCLK/4
CLOCK
CCLK/2
GENERATOR
CCLK
USB BLOCK
APB peripherals
002aad947
© NXP B.V. 2011. All rights reserved.
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