LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 66

• Manufacturer Part Number: LPC1767FBD100,551
• Description: IC ARM CORTEX MCU 512K 100-LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC17xxr

Specifications of LPC1767FBD100,551

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x12b, D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: LPC17
• Core: ARM Cortex M3
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
• For Use With: 622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-4967; 935289808551

NXP Semiconductors
4.10
UM10360
User manual
Fig 12. CLKOUT selection
External clock output pin
4.10.1 Clock Output Configuration register (CLKOUTCFG - 0x400F C1C8)
For system test and development purposes, any one of several internal clocks may be
brought out on the CLKOUT function available on the P1.27 pin, as shown in
Clocks that may be observed via CLKOUT are the CPU clock (cclk), the main oscillator
(osc_clk), the internal RC oscillator (irc_osc), the USB clock (usb_clk), and the RTC clock
(rtc_clk).
The CLKOUTCFG register controls the selection of the internal clock that appears on the
CLKOUT pin and allows dividing the clock by an integer value up to 16. The divider can be
used to produce a system clock that is related to one of the on-chip clocks. For most clock
sources, the division may be by 1. When the CPU clock is selected and is higher than
approximately 50 MHz, the output must be divided in order to bring the frequency within
the ability of the pin to switch with reasonable logic levels.
Note: The CLKOUT multiplexer is designed to switch cleanly, without glitches, between
the possible clock sources. The divider is also designed to allow changing the divide value
without glitches.
Table 47.
Bit
3:0
CLKOUTCFG[3:0]
Symbol
CLKOUTSEL
cclk
osc_clk
irc_osc
usb_clk
rtc_clk
Clock Output Configuration register (CLKOUTCFG - 0x400F C1C8) bit description
All information provided in this document is subject to legal disclaimers.
000
001
010
011
100
Value Description
0000
0001
0010
0011
0100
others Reserved, do not use these settings.
Rev. 2 — 19 August 2010
CLKOUTCFG[7:4]
CLKOUT
Divider
Selects the clock source for the CLKOUT function.
Selects the CPU clock as the CLKOUT source.
Selects the main oscillator as the CLKOUT source.
Selects the Internal RC oscillator as the CLKOUT source.
Selects the USB clock as the CLKOUT source.
Selects the RTC oscillator as the CLKOUT source.
Chapter 4: LPC17xx Clocking and power control
CLKOUTCFG[8]
CLKOUTCFG[9]
Clock Enable
Syncronizer
CLKOUT
UM10360
© NXP B.V. 2010. All rights reserved.
Figure
66 of 840
Reset
value
0
12.