OM13013,598 NXP Semiconductors, OM13013,598 Datasheet - Page 52
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OM13013,598
Manufacturer Part Number
OM13013,598
Description
BOARD DEMO IAR LPC1227 JLINKLITE
Manufacturer
NXP Semiconductors
Series
-r
Specifications of OM13013,598
Design Resources
LPC122x-SK Brd Schematic
Processor To Be Evaluated
LPC1227
Processor Series
LPC122x
Data Bus Width
32 bit
Interface Type
UART, SSP, SPI, I2C
Cpu Core
ARM Cortex-M0
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
3 V to 3.6 V
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-6885
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4.10 System PLL functional description
UM10441
User manual
Fig 4.
sys_osc_clk
irc_osc_clk
SYSPLLCLKSEL
System PLL block diagram
The LPC122x uses the system PLL to create the clocks for the core and peripherals.
The block diagram of this PLL is shown in
to 25 MHz. The input clock is fed directly to the Phase-Frequency Detector (PFD). This
block compares the phase and frequency of its inputs, and generates a control signal
when phase and/ or frequency do not match. The loop filter filters these control signals
and drives the current controlled oscillator (CCO), which generates the main clock and
optionally two additional phases. The CCO frequency range is 156 MHz to
320 MHz.These clocks are either divided by 2×P by the programmable post divider to
2. Once the microcontroller has booted, read the deep power-down flag in the PCON
3. Clear the deep power-down flag in the PCON register
4. Read the content of the General Purpose registers if needed.
5. Read the RTC count.
6. (Optional) Clear the RTC interrupt in the RTC ICR register and the pending interrupt in
7. (Optional) Read the stored data in the general purpose registers
8. Set up the PMU for the next Deep power-down cycle.
– The PMU will turn on the on-chip voltage regulator. When the core voltage reaches
– All registers except the GPREG0 to GPREG3 will be in their reset state.
– The contents of the RTC registers will be preserved.
register
power-down.
the NVIC.
Table
PFD
the power-on-reset (POR) trip point, a system reset will be triggered and the
microcontroller re-boots.
58).
(Table
analog section
DETECT
LOCK
MSEL<4:0>
All information provided in this document is subject to legal disclaimers.
/M
pd
cd
57) to verify that the reset was caused by a wake-up event from Deep
5
Rev. 1 — 15 February 2011
pd
LOCK
Chapter 4: LPC122x System control (SYSCON)
Figure
PSEL<1:0>
4. The input frequency range is 10 MHz
2
/2P
pd
cd
(Table
55).
(Table 57
UM10441
© NXP B.V. 2011. All rights reserved.
and
FCLKOUT
52 of 442
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