LPC1114FHN33/203,5 NXP Semiconductors, LPC1114FHN33/203,5 Datasheet - Page 59
LPC1114FHN33/203,5
Manufacturer Part Number
LPC1114FHN33/203,5
Description
ARM Microcontrollers - MCU Cortex-M0 32 kB Fl 8 kB SRAM
Manufacturer
NXP Semiconductors
Datasheet
1.LPC1113FHN333035.pdf
(538 pages)
Specifications of LPC1114FHN33/203,5
Rohs
yes
Core
ARM Cortex M0
Processor Series
LPC1114
Data Bus Width
32 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
32 KB
Data Ram Size
8 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.6 V
Operating Temperature Range
- 65 C to + 150 C
Package / Case
HVQFN-33
Mounting Style
SMD/SMT
Factory Pack Quantity
260
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UM10398
User manual
5.5.1.4.1 Invalid frequency (device maximum clock rate exceeded)
5.5.1.4.2 Invalid frequency selection (system clock divider restrictions)
5.5.1.3 Param3: system PLL lock time-out
5.5.1.4 Code examples
CPU_FREQ_LTE can be used if the requested frequency should not be exceeded (such
as overall current consumption and/or power budget reasons).
CPU_FREQ_GTE helps applications that need a minimum level of CPU processing
capabilities.
CPU_FREQ_APPROX results in a system clock that is as close as possible to the
requested value (it may be greater than or less than the requested value).
If an illegal mode is specified, set_pll returns PLL_INVALID_MODE. If the expected
system clock is out of the range supported by this routine, set_pll returns
PLL_FREQ_NOT_FOUND. In these cases the current PLL setting is not changed and
Param0 is returned as Result1.
It should take no more than 100 s for the system PLL to lock if a valid configuration is
selected. If Param3 is zero, set_pll will wait indefinitely for the PLL to lock. A non-zero
value indicates how many times the code will check for a successful PLL lock event
before it returns PLL_NOT_LOCKED. In this case the PLL settings are unchanged and
Param0 is returned as Result1.
Remark: The time it takes the PLL to lock depends on the selected PLL input clock
source (IRC/system oscillator) and its characteristics. The selected source can
experience more or less jitter depending on the operating conditions such as power
supply and/or ambient temperature. This is why it is suggested that when a good known
clock source is used and a PLL_NOT_LOCKED response is received, the set_pll routine
should be invoked several times before declaring the selected PLL clock source invalid.
Hint: setting Param3 equal to the system PLL frequency [Hz] divided by 10000 will
provide more than enough PLL lock-polling cycles.
The following examples illustrate some of the features of set_pll discussed above.
command[0] = 12000;
command[1] = 60000;
command[2] = CPU_FREQ_EQU;
command[3] = 0;
(*rom)->pWRD->set_pll(command, result);
The above code specifies a 12 MHz PLL input clock and a system clock of exactly
60 MHz. The application was ready to infinitely wait for the PLL to lock. But the expected
system clock of 60 MHz exceeds the maximum of 50 MHz. Therefore set_pll returns
PLL_INVALID_FREQ in result[0] and 12000 in result[1] without changing the PLL
settings.
command[0] = 12000;
command[1] = 40;
command[2] = CPU_FREQ_LTE;
All information provided in this document is subject to legal disclaimers.
Rev. 12 — 24 September 2012
Chapter 5: LPC111x/LPC11Cxx Power profiles
UM10398
© NXP B.V. 2012. All rights reserved.
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