LPC1102UK データシートの表示（PDF） - NXP Semiconductors.
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LPC1102UK Datasheet PDF : 43 Pages
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NXP Semiconductors
LPC1102/1104
32-bit ARM Cortex-M0 microcontroller
SYSTEM CLOCK system clock
DIVIDER
AHB clock 0
(system)
18
AHB clocks 1 to 18
(memories
and peripherals)
AHBCLKCTRL[1:18]
(AHB clock enable)
IRC oscillator
watchdog oscillator
main clock
SPI0 PERIPHERAL
CLOCK DIVIDER
UART PERIPHERAL
CLOCK DIVIDER
SPI0
UART
IRC oscillator
external clock
MAINCLKSEL
(main clock select)
SYSTEM PLL
SYSPLLCLKSEL
(system PLL clock select)
IRC oscillator
watchdog oscillator
WDTUEN
(WDT clock update enable)
WDT CLOCK
DIVIDER
WDT
IRC oscillator
system oscillator
watchdog oscillator
CLKOUT PIN CLOCK
DIVIDER
CLKOUT pin
CLKOUTUEN
(CLKOUT update enable)
Fig 4. LPC1102/1104 clock generation block diagram
002aaf527
7.14.1.1 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 12 MHz. The IRC is
trimmed to 1 % accuracy over the entire voltage and temperature range.
Upon power-up or any chip reset, the LPC1102/1104 use the IRC as the clock source.
Software may later switch to one of the other available clock sources.
7.14.1.2 Watchdog oscillator
The watchdog oscillator can be used as a clock source that directly drives the CPU or the
watchdog timer. The watchdog oscillator nominal frequency is programmable between
9.4 kHz to 2.3 MHz. The frequency spread over processing and temperature is 40 %.
7.14.2 System PLL
The PLL accepts an input clock frequency in the range of 10 MHz to 25 MHz. The input
frequency is multiplied up to a high frequency with a Current Controlled Oscillator (CCO).
The multiplier can be an integer value from 1 to 32. The CCO operates in the range of
156 MHz to 320 MHz, so there is an additional divider in the loop to keep the CCO within
LPC1102_1104
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 26 September 2013
© NXP B.V. 2013. All rights reserved.
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