LPC553x reference manual: Table 315 SCT0 Signals wrong (SCTIMER)

danielholala — Thu, 18 Jun 2026 08:47:13 GMT

Hello,

I’d like to report what looks like a significant error in the LPC553x Reference Manual (Rev. 4), Table 315 “SCT0 signals (outputs)” when compared to the Data Sheet, Table 3, and ask which source is authoritative.

This is LPC553x Reference Manual, Rev. 4, Table 315 "SCT0 signals (outputs)":

There are 34 external pins listed in this table (if I counted correctly). A quick search through the LPC553x Data Sheet finds only 31 pins. Further, Table 315 lists PIO2_2, PIO2_9, PIO2_15, PIO2_30 and PIO2_31 as SCT0 output pins. As far as I can tell from the Data Sheet, the LPC553x only implements PIO2_0 and PIO2_1, so those Port-2 pins do not exist on this device.

Now, if you meticulously go through Table 3 of the data sheet and extract all SCT0_OUT pins, then you end up with a completely different table:

SCT0 signals (outputs) Connect to

SCT0_OUT0	PIO0_2, PIO0_17, PIO1_4, PIO1_23
SCT0_OUT1	PIO0_3, PIO0_18, PIO1_8, PIO1_24
SCT0_OUT2	PIO0_10, PIO0_15, PIO0_19, PIO1_9, PIO1_25
SCT0_OUT3	PIO0_22, PIO0_31, PIO1_10, PIO1_26
SCT0_OUT4	PIO0_23, PIO1_3, PIO1_17
SCT0_OUT5	PIO0_26, PIO1_18
SCT0_OUT6	PIO0_6, PIO0_27, PIO1_31
SCT0_OUT7	PIO0_21, PIO0_28, PIO1_19
SCT0_OUT8	PIO0_29, PIO1_13
SCT0_OUT9	PIO0_30

For my design I am using the datasheet Table 3 as the source of truth.

Please,

confirm that the Data Sheet (Rev 5.0) Table 3 is the authoritative source for SCT0 output pins,
confirm that table 315 of Reference Manual is incorrect,
confirm that my table above is correct.

Thanks.
Dan

LPC MicrocontrollersのトピックLPC553x reference manual: Table 315 SCT0 Signals wrong (SCTIMER)

LPC553x reference manual: Table 315 SCT0 Signals wrong (SCTIMER)