Datasheet

LPC55S6x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2019. All rights reserved.
Product data sheet Rev. 1.0 — 26 February 2019 46 of 123
NXP Semiconductors
LPC55S6x
32-bit ARM Cortex-M33 microcontroller
main_clk The main clock used by the CPU and AHB bus, and potentially many others. The main clock and its source
selection are shown in
Figure 5.
mclk_in The MCLK input function, when it is connected to a pin by selecting it in the IOCON block.
pll0_clk The output of the PLL0. The PLL0 and its source selection is shown in
Figure 5.
pll1_clk The output of the PLL1. The PLL1 and its source selection is shown in
Figure 5.
fro_1m The output of the low power oscillator.
“none” A tied-off source that should be selected to save power when the output of the related multiplexer is not used.
Table 10. Clocking diagram signal name descriptions
Name Description
Fig 5. Clock generation (Part 1 of 2)
$+%&/.',9
0DLQFORFNVHOHFW%
0$,1&/.6(/%>@
6\VWHP
&ORFN
'LYLGHU
FONBLQ
0DLQFORFNVHOHFW$
0$,1&/.6(/$>@
IURBP
IURBP
FONBLQ
NBRVF
3//FORFNVHOHFW
3//&/.6(/>@
IURBP
PDLQBFON
IURBKI
IURBP
SOOBFON
$'&&/.',9
$'&&ORFN
'LYLGHU
WR$'&
IURBKI
3//
VHWWLQJV
3//
PDLQBFON
QRQH









QRQH
SOOBFON
NBRVF




WR&38&38
$+%EXV6\QF
$3%HWF
86%FORFNVHOHFW
86%&/.6(/>@
)686%&/.',9
)686%
&ORFN'LYLGHU
WR)686%
[WDORXW
[WDOLQ
0DLQFU\VWDO
RVFLOODWRU
FONBLQ
SOOBFON
0&/.&ORFN6HOHFW
0&/.&/.6(/>@
0&/.',9
0&/.
'LYLGHU
0&/.SLQ
RXWSXW
SOOBFON
IURBKI
QRQH



)52+)',9
IURBKIBGLY
)52B+)
'LYLGHU
IURBKI
3//',9IRU
)OH[FRPPV
SOOBFONBGLY
3//
'LYLGHU
SOOBFON
IURBP




SOOBFON
:'7
'LYLGHU
:'7&/.',9>@
ZGWBFON
$'&FORFNVHOHFW
$'&&/.6(/>@
57&',9
+]WR57&
'LYLGHE\
N


;7$/.
)52.
57&.',9
.+]WR57&
'LYLGHE\
2VFN&ORFN6HOHFW
30&57&26&.>@
NBRVF
WR&/..RIDOO)OH[FRPP
,QWHUIDFHV57&267LPHU
V\QFKURQL]HGPXOWLSOH[HUVHH
UHJLVWHUGHVFULSWLRQVIRUGHWDLOV



SOOBFON
SOOBFON
IURBKI
QRQH





PDLQBFON
WR+686%3+<
;20B&75/
IURBP XWLFNBFON